- Mp3Player: sdk 0.7->0.8.0-dev, find audio-stream device, open_output with resampler (hz/ch), write via audio_stream_write, close on pause
- BookPlayer: close/open per format change via AudioStreamConfig, write via stream
- VoiceRecorder: input_handle open_input 16k/mono via audio_stream_read, output_handle open_output file rate via write/resampler
- ES8311 native 44100, old direct I2S at 16k caused 4.096MHz MCLK vs 11.29MHz -> fast playback
- Brick game correct because it uses audio-stream resampler path