https://docs.ai-thinker.com/en/esp32-audio-kit

Beispiel mit Volume-Control asl Grundlage für eigene Sonos-Box/Streaming-Box

https://github.com/espressif/esp-adf/blob/master/examples/player/pipeline_sdcard_mp3_control/main/play_sdcard_mp3_control_example.c

audio_hal_set_volume

ESP ADF https://espressif-docs.readthedocs-hosted.com/projects/esp-faq/en/latest/application-solution/audio-development-framework.html

https://docs.espressif.com/projects/esp-adf/en/latest/get-started/index.html