Kokoro with WebGPU on Android produces corrupted audio

[MarceloEmmerich]

System Info

Latest Chrome on Samsung S24. Device is detected as WebGPU and type is fp32.

Environment/Platform

• Website/web-app
• Browser extension
• Server-side (e.g., Node.js, Deno, Bun)
• Desktop app (e.g., Electron)
• Other (e.g., VSCode extension)

Description

Mobile version produces corrupted audio when using webgpu, tested on Android with Latest Chrome. When forced to WASM/q8, sound is perfect (but performance is bad).

Reproduction

Steps to reproduce:

1. visit kokorotts.net on mobile Chrome
2. enter any text
3. click "generate"
4. play generated audio

[MarceloEmmerich]

Screen_Recording_20250521_103344_Chrome.mp4

[xenova]

While this is most likely a hardware/browser-implementation issue, certain optimizations in #1382 should fix this too.