I would say that the behavior changes. When I try to play a 6-channel
video the sound becomes choppy (not a CPU issue as the CPU is used for
about 80%) and pulseaudio prints the following error messages:

E: module-alsa-sink.c: ALSA woke us up to write new data to the device,
but there was actually nothing to write! Most likely this is an ALSA
driver bug. Please report this issue to the ALSA developers. We were
woken up with POLLOUT set -- however a subsequent snd_pcm_avail_update()
returned 0.

When I remove the "tsched=0" thing the messages disappear and the sound
is back to normal. However, this problem does not manifest when simply
playing a simple stereo mp3 file. I am unable to reproduce the original
bug, either with or without the "tsched=0" setting.

-- 
pulseaudio sometimes pauses playback for 5 seconds
https://bugs.launchpad.net/bugs/319118
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