diff --git a/Cargo.lock b/Cargo.lock
index 664bede..4643eec 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -91,7 +91,7 @@ dependencies = [
  "accesskit_consumer",
  "hashbrown 0.15.5",
  "static_assertions",
- "windows",
+ "windows 0.58.0",
  "windows-core 0.58.0",
 ]
 
@@ -143,6 +143,28 @@ version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
 
+[[package]]
+name = "alsa"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "812947049edcd670a82cd5c73c3661d2e58468577ba8489de58e1a73c04cbd5d"
+dependencies = [
+ "alsa-sys",
+ "bitflags 2.11.1",
+ "cfg-if",
+ "libc",
+]
+
+[[package]]
+name = "alsa-sys"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ad7569085a265dd3f607ebecce7458eaab2132a84393534c95b18dcbc3f31e04"
+dependencies = [
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "android-activity"
 version = "0.6.1"
@@ -152,7 +174,7 @@ dependencies = [
  "android-properties",
  "bitflags 2.11.1",
  "cc",
- "jni",
+ "jni 0.22.4",
  "libc",
  "log",
  "ndk",
@@ -447,6 +469,15 @@ dependencies = [
  "objc2 0.5.2",
 ]
 
+[[package]]
+name = "block2"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdeb9d870516001442e364c5220d3574d2da8dc765554b4a617230d33fa58ef5"
+dependencies = [
+ "objc2 0.6.4",
+]
+
 [[package]]
 name = "blocking"
 version = "1.6.2"
@@ -556,6 +587,12 @@ dependencies = [
  "shlex",
 ]
 
+[[package]]
+name = "cesu8"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d43a04d8753f35258c91f8ec639f792891f748a1edbd759cf1dcea3382ad83c"
+
 [[package]]
 name = "cexpr"
 version = "0.6.0"
@@ -706,6 +743,50 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "coreaudio-rs"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16dd574a72a021b90c7656c474ea31d11a2f0366a8eff574186e761e0b9e3586"
+dependencies = [
+ "bitflags 2.11.1",
+ "libc",
+ "objc2-audio-toolbox",
+ "objc2-core-audio",
+ "objc2-core-audio-types",
+ "objc2-core-foundation",
+]
+
+[[package]]
+name = "cpal"
+version = "0.17.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8942da362c0f0d895d7cac616263f2f9424edc5687364dfd1d25ef7eba506d7"
+dependencies = [
+ "alsa",
+ "coreaudio-rs",
+ "dasp_sample",
+ "jni 0.21.1",
+ "js-sys",
+ "libc",
+ "mach2",
+ "ndk",
+ "ndk-context",
+ "num-derive",
+ "num-traits",
+ "objc2 0.6.4",
+ "objc2-audio-toolbox",
+ "objc2-avf-audio",
+ "objc2-core-audio",
+ "objc2-core-audio-types",
+ "objc2-core-foundation",
+ "objc2-foundation 0.3.2",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "windows 0.62.2",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.5.0"
@@ -768,6 +849,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f27ae1dd37df86211c42e150270f82743308803d90a6f6e6651cd730d5e1732f"
 
+[[package]]
+name = "dasp_sample"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c87e182de0887fd5361989c677c4e8f5000cd9491d6d563161a8f3a5519fc7f"
+
 [[package]]
 name = "derive_more"
 version = "0.99.20"
@@ -1368,6 +1455,22 @@ version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
 
+[[package]]
+name = "jni"
+version = "0.21.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a87aa2bb7d2af34197c04845522473242e1aa17c12f4935d5856491a7fb8c97"
+dependencies = [
+ "cesu8",
+ "cfg-if",
+ "combine",
+ "jni-sys 0.3.1",
+ "log",
+ "thiserror 1.0.69",
+ "walkdir",
+ "windows-sys 0.45.0",
+]
+
 [[package]]
 name = "jni"
 version = "0.22.4"
@@ -1608,6 +1711,15 @@ dependencies = [
  "urid",
 ]
 
+[[package]]
+name = "mach2"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a1b95cd5421ec55b445b5ae102f5ea0e768de1f82bd3001e11f426c269c3aea"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "memchr"
 version = "2.8.0"
@@ -1703,6 +1815,17 @@ dependencies = [
  "minimal-lexical",
 ]
 
+[[package]]
+name = "num-derive"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed3955f1a9c7c0c15e092f9c887db08b1fc683305fdf6eb6684f22555355e202"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -1766,7 +1889,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e4e89ad9e3d7d297152b17d39ed92cd50ca8063a89a9fa569046d41568891eff"
 dependencies = [
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "libc",
  "objc2 0.5.2",
  "objc2-core-data",
@@ -1787,6 +1910,31 @@ dependencies = [
  "objc2-foundation 0.3.2",
 ]
 
+[[package]]
+name = "objc2-audio-toolbox"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6948501a91121d6399b79abaa33a8aa4ea7857fe019f341b8c23ad6e81b79b08"
+dependencies = [
+ "bitflags 2.11.1",
+ "libc",
+ "objc2 0.6.4",
+ "objc2-core-audio",
+ "objc2-core-audio-types",
+ "objc2-core-foundation",
+ "objc2-foundation 0.3.2",
+]
+
+[[package]]
+name = "objc2-avf-audio"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13a380031deed8e99db00065c45937da434ca987c034e13b87e4441f9e4090be"
+dependencies = [
+ "objc2 0.6.4",
+ "objc2-foundation 0.3.2",
+]
+
 [[package]]
 name = "objc2-cloud-kit"
 version = "0.2.2"
@@ -1794,7 +1942,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "74dd3b56391c7a0596a295029734d3c1c5e7e510a4cb30245f8221ccea96b009"
 dependencies = [
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-core-location",
  "objc2-foundation 0.2.2",
@@ -1806,11 +1954,34 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a5ff520e9c33812fd374d8deecef01d4a840e7b41862d849513de77e44aa4889"
 dependencies = [
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-foundation 0.2.2",
 ]
 
+[[package]]
+name = "objc2-core-audio"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1eebcea8b0dbff5f7c8504f3107c68fc061a3eb44932051c8cf8a68d969c3b2"
+dependencies = [
+ "dispatch2",
+ "objc2 0.6.4",
+ "objc2-core-audio-types",
+ "objc2-core-foundation",
+ "objc2-foundation 0.3.2",
+]
+
+[[package]]
+name = "objc2-core-audio-types"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a89f2ec274a0cf4a32642b2991e8b351a404d290da87bb6a9a9d8632490bd1c"
+dependencies = [
+ "bitflags 2.11.1",
+ "objc2 0.6.4",
+]
+
 [[package]]
 name = "objc2-core-data"
 version = "0.2.2"
@@ -1818,7 +1989,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "617fbf49e071c178c0b24c080767db52958f716d9eabdf0890523aeae54773ef"
 dependencies = [
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-foundation 0.2.2",
 ]
@@ -1830,7 +2001,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a180dd8642fa45cdb7dd721cd4c11b1cadd4929ce112ebd8b9f5803cc79d536"
 dependencies = [
  "bitflags 2.11.1",
+ "block2 0.6.2",
  "dispatch2",
+ "libc",
  "objc2 0.6.4",
 ]
 
@@ -1840,7 +2013,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55260963a527c99f1819c4f8e3b47fe04f9650694ef348ffd2227e8196d34c80"
 dependencies = [
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-foundation 0.2.2",
  "objc2-metal",
@@ -1852,7 +2025,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "000cfee34e683244f284252ee206a27953279d370e309649dc3ee317b37e5781"
 dependencies = [
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-contacts",
  "objc2-foundation 0.2.2",
@@ -1871,7 +2044,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ee638a5da3799329310ad4cfa62fbf045d5f56e3ef5ba4149e7452dcf89d5a8"
 dependencies = [
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "dispatch",
  "libc",
  "objc2 0.5.2",
@@ -1884,6 +2057,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3e0adef53c21f888deb4fa59fc59f7eb17404926ee8a6f59f5df0fd7f9f3272"
 dependencies = [
  "bitflags 2.11.1",
+ "block2 0.6.2",
+ "libc",
  "objc2 0.6.4",
  "objc2-core-foundation",
 ]
@@ -1894,7 +2069,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a1a1ae721c5e35be65f01a03b6d2ac13a54cb4fa70d8a5da293d7b0020261398"
 dependencies = [
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-app-kit 0.2.2",
  "objc2-foundation 0.2.2",
@@ -1907,7 +2082,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd0cba1276f6023976a406a14ffa85e1fdd19df6b0f737b063b95f6c8c7aadd6"
 dependencies = [
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-foundation 0.2.2",
 ]
@@ -1919,7 +2094,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e42bee7bff906b14b167da2bac5efe6b6a07e6f7c0a21a7308d40c960242dc7a"
 dependencies = [
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-foundation 0.2.2",
  "objc2-metal",
@@ -1942,7 +2117,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b8bb46798b20cd6b91cbd113524c490f1686f4c4e8f49502431415f3512e2b6f"
 dependencies = [
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-cloud-kit",
  "objc2-core-data",
@@ -1962,7 +2137,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "44fa5f9748dbfe1ca6c0b79ad20725a11eca7c2218bceb4b005cb1be26273bfe"
 dependencies = [
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-foundation 0.2.2",
 ]
@@ -1974,7 +2149,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "76cfcbf642358e8689af64cee815d139339f3ed8ad05103ed5eaf73db8d84cb3"
 dependencies = [
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "objc2 0.5.2",
  "objc2-core-location",
  "objc2-foundation 0.2.2",
@@ -3008,6 +3183,9 @@ dependencies = [
 name = "ui"
 version = "0.1.0"
 dependencies = [
+ "cpal",
+ "crossbeam-channel",
+ "engine",
  "params",
  "vizia",
 ]
@@ -3541,7 +3719,28 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd04d41d93c4992d421894c18c8b43496aa748dd4c081bac0dc93eb0489272b6"
 dependencies = [
  "windows-core 0.58.0",
- "windows-targets",
+ "windows-targets 0.52.6",
+]
+
+[[package]]
+name = "windows"
+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "527fadee13e0c05939a6a05d5bd6eec6cd2e3dbd648b9f8e447c6518133d8580"
+dependencies = [
+ "windows-collections",
+ "windows-core 0.62.2",
+ "windows-future",
+ "windows-numerics",
+]
+
+[[package]]
+name = "windows-collections"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b2d95af1a8a14a3c7367e1ed4fc9c20e0a26e79551b1454d72583c97cc6610"
+dependencies = [
+ "windows-core 0.62.2",
 ]
 
 [[package]]
@@ -3554,7 +3753,7 @@ dependencies = [
  "windows-interface 0.58.0",
  "windows-result 0.2.0",
  "windows-strings 0.1.0",
- "windows-targets",
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -3570,6 +3769,17 @@ dependencies = [
  "windows-strings 0.5.1",
 ]
 
+[[package]]
+name = "windows-future"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1d6f90251fe18a279739e78025bd6ddc52a7e22f921070ccdc67dde84c605cb"
+dependencies = [
+ "windows-core 0.62.2",
+ "windows-link",
+ "windows-threading",
+]
+
 [[package]]
 name = "windows-implement"
 version = "0.58.0"
@@ -3620,13 +3830,23 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
 
+[[package]]
+name = "windows-numerics"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e2e40844ac143cdb44aead537bbf727de9b044e107a0f1220392177d15b0f26"
+dependencies = [
+ "windows-core 0.62.2",
+ "windows-link",
+]
+
 [[package]]
 name = "windows-result"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d1043d8214f791817bab27572aaa8af63732e11bf84aa21a45a78d6c317ae0e"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -3645,7 +3865,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4cd9b125c486025df0eabcb585e62173c6c9eddcec5d117d3b6e8c30e2ee4d10"
 dependencies = [
  "windows-result 0.2.0",
- "windows-targets",
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -3657,13 +3877,22 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.45.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
+dependencies = [
+ "windows-targets 0.42.2",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -3672,7 +3901,7 @@ version = "0.59.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -3684,34 +3913,76 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "windows-targets"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
+dependencies = [
+ "windows_aarch64_gnullvm 0.42.2",
+ "windows_aarch64_msvc 0.42.2",
+ "windows_i686_gnu 0.42.2",
+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
+ "windows_x86_64_msvc 0.42.2",
+]
+
 [[package]]
 name = "windows-targets"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
 dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
+ "windows_aarch64_gnullvm 0.52.6",
+ "windows_aarch64_msvc 0.52.6",
+ "windows_i686_gnu 0.52.6",
  "windows_i686_gnullvm",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_i686_msvc 0.52.6",
+ "windows_x86_64_gnu 0.52.6",
+ "windows_x86_64_gnullvm 0.52.6",
+ "windows_x86_64_msvc 0.52.6",
 ]
 
+[[package]]
+name = "windows-threading"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3949bd5b99cafdf1c7ca86b43ca564028dfe27d66958f2470940f73d86d75b37"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
+
 [[package]]
 name = "windows_aarch64_gnullvm"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
 
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
+
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
 
+[[package]]
+name = "windows_i686_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
+
 [[package]]
 name = "windows_i686_gnu"
 version = "0.52.6"
@@ -3724,24 +3995,48 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
 
+[[package]]
+name = "windows_i686_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.52.6"
@@ -3758,7 +4053,7 @@ dependencies = [
  "android-activity",
  "atomic-waker",
  "bitflags 2.11.1",
- "block2",
+ "block2 0.5.1",
  "bytemuck",
  "calloop 0.13.0",
  "cfg_aliases",
diff --git a/Cargo.toml b/Cargo.toml
index 72ef720..df4f929 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,3 +19,4 @@ lv2 = "0.6.0"
 vizia = "0.3.0"
 atomic_float = "1.1.0"
 crossbeam-channel = "0.5.15"
+cpal = "0.17.3"
diff --git a/crates/ui/Cargo.toml b/crates/ui/Cargo.toml
index 9d0b384..37ea7eb 100644
--- a/crates/ui/Cargo.toml
+++ b/crates/ui/Cargo.toml
@@ -6,3 +6,6 @@ edition.workspace = true
 [dependencies]
 params = { workspace = true }
 vizia = { workspace = true }
+engine = { workspace = true}
+crossbeam-channel = { workspace = true }
+cpal = { workspace = true }
diff --git a/crates/ui/src/app.rs b/crates/ui/src/app.rs
index 219e539..432cabb 100644
--- a/crates/ui/src/app.rs
+++ b/crates/ui/src/app.rs
@@ -1,3 +1,4 @@
+use crossbeam_channel::Sender;
 use params::{ParamId, ParamStore};
 use vizia::prelude::*;
 
@@ -6,6 +7,13 @@ use crate::widgets::piano::PianoKeyboard;
 pub const MOD_NSRC: usize = 19;
 pub const MOD_NDST: usize = 11;
 
+#[derive(Clone, Copy, Debug)]
+pub enum MidiMsg {
+    NoteOn(u8, u8),
+    NoteOff(u8),
+    AllNotesOff,
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Data)]
 pub enum Panel {
     Voice,
@@ -41,10 +49,12 @@ pub struct AppData {
     pub active_env: usize,
     pub active_lfo: usize,
     pub fx_selected: usize,
+    #[lens(ignore)]
+    pub midi_tx: Sender<MidiMsg>,
 }
 
 impl AppData {
-    pub fn new(store: ParamStore) -> Self {
+    pub fn new(store: ParamStore, midi_tx: Sender<MidiMsg>) -> Self {
         let params = (0..ParamId::COUNT)
             .map(|i| store.get(unsafe { std::mem::transmute::<usize, ParamId>(i) }))
             .collect();
@@ -63,6 +73,7 @@ impl AppData {
             active_env: 0,
             active_lfo: 0,
             fx_selected: 0,
+            midi_tx,
         }
     }
 }
@@ -96,34 +107,45 @@ impl Model for AppData {
                 self.params[*id as usize] = *val;
                 self.store.set(*id, *val);
             }
+
             AppEvent::SetPanel(p) => self.active_panel = *p,
+            AppEvent::SelectEnv(i) => self.active_env = *i,
+            AppEvent::SelectLfo(i) => self.active_lfo = *i,
+            AppEvent::SelectFx(i) => self.fx_selected = *i,
+
             AppEvent::UpdateMetrics { voices, cpu } => {
                 self.voice_count = *voices;
                 self.cpu_load = *cpu;
             }
-            AppEvent::NoteOn(note, _) => {
+
+            AppEvent::NoteOn(note, vel) => {
                 if !self.held_notes.contains(note) {
                     self.held_notes.push(*note);
                 }
+                let _ = self.midi_tx.try_send(MidiMsg::NoteOn(*note, *vel));
             }
-            AppEvent::NoteOff(note) => self.held_notes.retain(|n| n != note),
+            AppEvent::NoteOff(note) => {
+                self.held_notes.retain(|n| n != note);
+                let _ = self.midi_tx.try_send(MidiMsg::NoteOff(*note));
+            }
+
             AppEvent::OctaveUp => self.octave = (self.octave + 1).min(8),
             AppEvent::OctaveDown => self.octave = (self.octave - 1).max(0),
+
             AppEvent::SetModDepth { src, dst, depth } => {
                 let idx = src * MOD_NDST + dst;
                 if idx < self.mod_depths.len() {
                     self.mod_depths[idx] = depth.clamp(-1.0, 1.0);
                 }
             }
+
             AppEvent::ToggleFx(s) => {
                 if *s < self.fx_enabled.len() {
                     self.fx_enabled[*s] = !self.fx_enabled[*s];
                 }
             }
-            AppEvent::SelectEnv(i) => self.active_env = *i,
-            AppEvent::SelectLfo(i) => self.active_lfo = *i,
-            AppEvent::SelectFx(i) => self.fx_selected = *i,
         });
+
         event.map(|we: &WindowEvent, _| {
             crate::widgets::piano::handle_kbd(cx, we, self.octave);
         });
@@ -158,3 +180,14 @@ pub fn build_root(cx: &mut Context) {
     .width(Stretch(1.0))
     .height(Stretch(1.0));
 }
+
+fn tab_button(cx: &mut Context, p: Panel) {
+    Binding::new(cx, AppData::active_panel, move |cx, active_lens| {
+        let active = active_lens.get(cx) == p;
+        Label::new(cx, p.label())
+            .class("top-tab")
+            .checked(active)
+            .on_press(move |cx| cx.emit(AppEvent::SetPanel(p)))
+            .height(Stretch(1.0));
+    });
+}
diff --git a/crates/ui/src/main.rs b/crates/ui/src/main.rs
index 3873f2e..59bfb38 100644
--- a/crates/ui/src/main.rs
+++ b/crates/ui/src/main.rs
@@ -2,15 +2,28 @@ mod app;
 mod panels;
 mod widgets;
 
+use std::sync::Arc;
+
+use app::{AppData, MidiMsg};
+use crossbeam_channel::bounded;
+use engine::oscillator::WavetableBank;
+use engine::synth::Synth;
+use params::ParamStore;
+use vizia::prelude::*;
+
 fn main() {
-    use app::AppData;
-    use params::ParamStore;
-    use vizia::prelude::*;
+    let store = ParamStore::new();
+    let bank = Arc::new(WavetableBank::new());
+
+    let (midi_tx, midi_rx) = bounded::<MidiMsg>(1024);
+
+    let audio_store = store.clone();
+    let _stream = build_audio_stream(audio_store, bank, midi_rx);
 
     let _ = Application::new(|cx| {
         cx.add_stylesheet(include_str!("theme.css"))
             .expect("theme.css");
-        AppData::new(ParamStore::new()).build(cx);
+        AppData::new(store, midi_tx).build(cx);
         app::build_root(cx);
         cx.focus();
     })
@@ -19,3 +32,92 @@ fn main() {
     .resizable(false)
     .run();
 }
+
+fn build_audio_stream(
+    store: ParamStore,
+    bank: Arc<WavetableBank>,
+    midi_rx: crossbeam_channel::Receiver<MidiMsg>,
+) -> cpal::Stream {
+    use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
+
+    let host = cpal::default_host();
+    let device = host
+        .default_output_device()
+        .expect("no audio output device available");
+
+    let config = device
+        .default_output_config()
+        .expect("no default output config");
+
+    let sr = config.sample_rate() as f32;
+
+    let synth = Synth::new(sr, store, bank);
+
+    let host_bpm = 120.0f32;
+
+    let stream = match config.sample_format() {
+        cpal::SampleFormat::F32 => {
+            build_stream_f32(&device, &config.into(), synth, midi_rx, host_bpm)
+        }
+        _fmt => {
+            let cfg: cpal::StreamConfig = config.into();
+            build_stream_f32(&device, &cfg, synth, midi_rx, host_bpm)
+        }
+    };
+
+    stream.play().expect("failed to start audio stream");
+    stream
+}
+
+fn build_stream_f32(
+    device: &cpal::Device,
+    config: &cpal::StreamConfig,
+    mut synth: Synth,
+    midi_rx: crossbeam_channel::Receiver<MidiMsg>,
+    host_bpm: f32,
+) -> cpal::Stream {
+    use cpal::traits::DeviceTrait;
+
+    let channels = config.channels as usize;
+
+    device
+        .build_output_stream(
+            config,
+            move |data: &mut [f32], _info: &cpal::OutputCallbackInfo| {
+                while let Ok(msg) = midi_rx.try_recv() {
+                    match msg {
+                        MidiMsg::NoteOn(note, vel) => synth.note_on(note, vel),
+                        MidiMsg::NoteOff(note) => synth.note_off(note),
+                        MidiMsg::AllNotesOff => {
+                            for n in 0..128 {
+                                synth.note_off(n);
+                            }
+                        }
+                    }
+                }
+
+                let frame_count = data.len() / channels;
+                for frame in 0..frame_count {
+                    let (l, r) = synth.process(host_bpm);
+                    let base = frame * channels;
+                    match channels {
+                        1 => data[base] = (l + r) * 0.5,
+                        2 => {
+                            data[base] = l;
+                            data[base + 1] = r;
+                        }
+                        n => {
+                            data[base] = l;
+                            data[base + 1] = r;
+                            for ch in 2..n {
+                                data[base + ch] = 0.0;
+                            }
+                        }
+                    }
+                }
+            },
+            |err| eprintln!("audio stream error: {err}"),
+            None,
+        )
+        .expect("failed to build output stream")
+}