What I meant was, with arts producing sounds of breaking glass etc, for desktop events there was a 1 second (literally - it's an eternity) delay. As it happens I found out how to switch off arts after making this post and switched it off. So no desktop sound effects. The television sound latency, the only thing I could think of to do as a basis for, as you suggest, comparison, is very much shorter.
Went to elaborate lenths to get rid of tv latency, eventually using CD-cable thing from capture card to sound card. I thought it was perfectly natural to have bad sound latency with tv and alsa.
Having big trouble with mythtv at the moment, sound far to fast and high pitched, and video keeps ?skipping.
Video is 3.0031 frames behind audio (too slow), dropping frame to catch up.
2009-03-26 06:01:14.498 AO, ERROR: Audio buffer overflow, 7996 audio samples lost!
Perhaps related to latency problem, if you say it is a problem.
I'll try latest kernel, newer than 26. Sound card is supposed to be fully supported except for ?HDMI. Nothing I can spot in dmesg. Thanks.