Sound desynchronization during IPS drops

[Vort]

While playing games, IPS may drop sometimes.
Each time it happens, sound in game becomes more and more lagged.

For testing purposes, IPS drop can be simulated by opening and closing Bochs config window.
In this video, sound is synchronized when character collects coins at 0:28.
At 0:34, I open config menu, then wait till 0:47 for IPS stabilization.
When next coins are collected at 0:49, corresponding sound appears only at 0:52.

bochs_sound_desync.mp4

I think this problem can be solved by introducing new sound configuration option, maxlag for example.
Which will specify maximum time in milliseconds, allowed for sound packet to wait in queue.
Packets, which are delayed for more, should be discarded.

In my opinion, this is the last annoyance, which prevents gaming with Bochs.

Test files: superfrog.zip.
Version: 911e17f.