Bluetooth: 2nd song played shortly ignores Sound Check for a couple of seconds

Number:rdar://FB7381930 Date Originated:Oct 15, 2019
Status:Open Resolved:
Product:Music Product Version:
Classification:Unexpected Behavior Reproducible:Always
- I instruct Siri to play a playlist while connected to a Bluetooth speaker (either my car or an external speaker, issue is reproducible either way).

- The first song of the playlist plays at normal sound level.

- The 2nd song starts playing at full sound level as if Sound Check was disabled (usually much louder than the first song).

- After around 5-10 seconds, it decreases volume back to Sound Check level. From there on it continues playing at this level over all other songs to come.

Every time I connect to a Bluetooth device and start playing a playlist this issue is reproducible. The Sysdiagnose file was created shortly after the 2nd song played and the volume went back to normal level.


If you need two songs to reproduce that effect, let me know. I can upload two songs from your own store here, just add them to a play list, make sure Volume Check is enabled and play the playlist via Bluetooth. You will notice that at the beginning of the 2nd song, the volume raises dramatically for a few seconds before it goes back to normal level. This happens only once when starting the playlist, it it continues to play on repeat, the volume stays low. If you stop playback completely and play another playlist, even one with the same two songs, you can reproduce the issue again.

By m.hanauska at June 15, 2020, 12:23 p.m. (reply...)

Problem persists with iOS 13.5.1 and is still reproducible with all Bluetooth speakers, so it is no problem of the speakers. Please let me konw what you need to fix that as especially during car playback this issue is very dangerous as it can shock you while driving your car and this can easily cause an accident when suddenly the loudness raises by over 30-50%

By m.hanauska at June 15, 2020, 12:21 p.m. (reply...)

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