Background music can trigger ducking without speech

[yyovil]

Summary

Aptune can react to background music and lower the system volume even when no one is speaking.

Reproduction

1. Start Aptune.
2. Play music or other sustained background audio through the speakers.
3. Observe that the speech detector can still trigger ducking.

Expected

Background music alone should not be treated as speech.

Actual

Speaker playback can bleed into the microphone path and cause false speech detections.

Notes

A likely mitigation is adding an acoustic echo cancellation or playback-reference path so speaker output is not misclassified as live speech.