[SAGIRIxr]

The bug

With conversation awareness on, the volume does duck while you talk. But once you stop it comes back higher than it was, and each conversation pushes it a bit further. Captured on a Xiaomi 14 Pro (HyperOS's volume scale is 0..150, so 43 % = 64 and 20 % = 30), starting from 44:

conversation awareness state: 1
Starting speaking, initial volume: 44
Smooth volume transition from 44 to 64        <- "ducking" raises it
conversation awareness state: 7
Smooth volume transition from 45 to 44
conversation awareness state: 1
Starting speaking, initial volume: 46          <- re-recorded mid-ramp
Smooth volume transition from 46 to 64
conversation awareness state: 7
Smooth volume transition from 47 to 46
conversation awareness state: 1
Starting speaking, initial volume: 48
...                                              57, 59, 61, 62 ...
Starting speaking, initial volume: 64
conversation awareness state: 2
Smooth volume transition from 64 to 30
conversation awareness state: 7
Smooth volume transition from 63 to 64        <- "restores" to 64

Three things compound:

1. The ducked levels are absolute (conversationAwarenessVolume = 43 %, conversationAwarenessReducedVolume = 20 % of max) and are never compared with the current volume. Below 43 %, level 1 and level 3 raise the volume. The previous startSpeaking(), still in MediaController but commented out, had an initialVolume > max * percent guard for this.
2. Ramps are never cancelled. Each smoothVolumeTransition posts its own 50 ms stepper, so a ramp heading up to the ducked level keeps running underneath the restore and can be the last one to write.
3. The AirPods flap between 1 and 7 for about the first second after you start talking. stopSpeaking() clears initialVolume, so the next 1 records whatever the still-running ramp has reached. The "original" volume ratchets up 44 → 46 → 48 → … → 64, and that's what gets restored.

The fix

• MediaController.duckVolume(percent): like setVolume, but capped at the volume recorded when speaking started, so ducking can only lower.
• smoothVolumeTransition stamps each ramp with a generation number, and a ramp that has been superseded stops instead of finishing.
• Level 2 also calls startSpeaking(). Both 1 and 2 mean "started speaking", and startSpeaking() only records when nothing is recorded yet, so a sequence that opens on 2 still gets restored.

setVolume is left unchanged for any other caller.

Testing

On the same device, starting at 40/150, I talked in four separate bursts with music playing. The build I tested also carried #852 (strings only, it doesn't touch this code path). This branch is the same commit cherry-picked onto the current android/rewrite. Every burst recorded 40 as the starting volume, ducked 40 → 30, and came back to 40:

Starting speaking, initial volume: 40
Smooth volume transition from 40 to 40        <- level 1 no longer raises
Smooth volume transition from 40 to 30        <- level 2
Smooth volume transition from 30 to 40        <- level 3, capped at 40
Smooth volume transition from 31 to 40        <- restore
... next burst:
Starting speaking, initial volume: 40