Dave,

You won't see any improvement until you enable glitch-free audio
(providing that glitch-free works for your hardware) - see the recent
posts by myself and Daniel. Until this is done officially, you can edit
the configuration files yourself:

1. Create a copy of the configuration files to your user's pulse folder:
$ cp /etc/pulse/* ~/.pulse/

2. Edit ~/.pulse/default.pa, do a search for "tsched=0" and change to
"tsched=1".

3. (Optional). Edit ~/.pulse/daemon.conf and comment the "resample-
method", "default-fragments" and "default-fragments-msec" lines, like
so:

; resample-method = speex-float-1
; default-fragments = 8
; default-fragment-size-msec = 10 

This should completely eliminate stuttering, as long as your audio card
doesn't trigger certain kernel bugs (see my previous comment to see a
related bug).

Note: be sure to delete the contents of ~/.pulse/ to revert these
settings if there is a pulseaudio update, otherwise the newer
configuration files in /etc/pulse will get ignored.

-- 
Crackling / scratching noise using Pulseaudio
https://bugs.launchpad.net/bugs/345627
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