Alan Taylor <alan-linuxaudiouser@xxxxxxxx> writes: > On Sat, 2005-04-23 at 08:44 +0100, Rob Fell wrote: >> The most obvious reason I can see for this is that the effective sample >> rate is reduced to 12kHz via this method. >> >> If you can increase your soundcard sample frequency, this should yield a >> dramatic improvement (96kHz sample rate becomes effective 24kHz). > > That makes sense, but I seem to be having trouble getting JACK to run at > anything above 48KHz. When I start it at 88.2KHz or 96KHz, I > immediately get messages such as "XRUN callback (xx skipped)", where xx > is a number between 50 and 300, depending on which sample rate and > frames/period I choose. I get at least 50 skipped callbacks per second > without doing anything but starting jackd. > > If I am not mistaken, the Delta 44 should be able to handle at least up > to 96KHz. I believe my kernel is set up properly since I can record 6 > or 7 tracks at 48KHz and 512 frames/period in RT mode for an extended > period of time without any xruns at all. > > Any suggestions? When you double the sample rate you generally need to double the buffer size. So, -r96000 -p1024 would be equivalent to -r48000 -p512. Your latency is the same, either way. -- joq
