On Fri, 11 Dec 2009, david wrote: > Just wondering. Without an RT kernel here, my 2 laptops seem to run my > simple audio needs pretty well at 64msec latency. At least, it's never > bothered my playing along with computer-generated audio. If your recording card can provide its own monitoring (M-Audio Delta and RME Hammerfall family both can), then for most things, your Jack latency doesn't seem to even matter. I keep mine set to 21ms 99% of the time I use Jack, even though my system is very fast and stable, and is capable of running at *2ms* all day without xruns. When the recording card is providing your monitoring, you basically have *zero* latency regardless of how your Jack settings are configured, and then it doesn't matter, because then you're in the wonderful world of hardware. :) Where it does start to matter is when you start using software-based sound sources, like LinuxSampler, or virtual synths. Your recording card's monitoring can't help you much with that, and then you just need good enough latency to not end up feeling like you're hearing the output of what you're playing only after it's gone through a tape delay. Probably anything under 10ms is decent, but if you don't have some awful USB-based interface (which are a recipe for latency hell usually), you can probably do a lot better than even that. > I see people on the list running much lower latencies than 64msec, and > seemingly trying to get even lower ... It does seem to be almost a competition sometimes... Seriously, as some other people have pointed out once on here, you get a certain amount of natural latency in the acoustic world just from having a jazz group performing on a stage with some space between the players, since sound does take some time to travel, and the human ear can perceive *really* small timing differences in sound arrival timing as stereo position, distance, direction, and all that. It still doesn't keep anyone from playing music on a stage though! Any Jack latency under 10ms is really good. I keep mine at 21ms when I'm working entirely with hardware monitoring and hardware musical instruments and effects (which is most of the time). The Hammerfall/Multiface has its own hardware-based zero-latency monitoring and makes it not matter at all in that circumstance. -- + Brent A. Busby + "We've all heard that a million monkeys + UNIX Systems Admin + banging on a million typewriters will + University of Chicago + eventually reproduce the entire works of + Physical Sciences Div. + Shakespeare. Now, thanks to the Internet, + James Franck Institute + we know this is not true." -Robert Wilensky _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
