As I understand it (and I may be wrong so please put me right if I am) the 
problem is caused by the "glitch-free" mode of pulseaudio. In order for  
"glitch-free" to work properly a responsive kernel is needed, i.e. latency in 
the order of a few milliseconds. In order to get this the kernel needs to be 
compiled with pre-empt enabled and HZ=1000.

As I understand it Debian does not compile its stock kernels with these 
settings. So we need to turn off  "glitch-free" and go back to the way PA used 
to do its processing. This can be done by editing:

/etc/pulse/default.pa

Find the line like this:

load-module module-udev-detect

and append "tsched=0" to the end so that it looks like this:

load-module module-udev-detect tsched=0

Re-start your PC and see if this helps.

-- 
Geoff



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