Web audio can play a couple of semitones too low.

[ctrlaltdavid]

And when it does this, the packets aren't processed fast enough so the ring buffer keeps overflowing then dropping frames which means that the audio has repeated glitches.

Partial repro: Using the Web SDK example app and native client, connect both to a distant server; use the native client's microphone and listen to it in the example app; disconnect and reconnect the example app; the audio will now sometimes suffer the problem.