I have 8ms on M-Audio FW 410 on windows, and It's ok ! for playin keys So the Ediroll board sounds ok (I guess) being portable also Florian Paul Schmidt <mista.tapas@xxxxxxx> writes: > On Fri, 05 May 2006 00:51:49 +0000 > Cesare Marilungo <cesare@xxxxxxxxxxxxxxxxx> wrote: > >> > 6. MIDI is necessary and also lowest latency possible. (which I don't know >> > what it is on linux) > >> I'm really happy with my Edirol UA-25. >> >> http://www.roland.com/products/en/_support/dld.cfm?ln=en&dsp=0&iCncd=526 >> >> Latency could be set as low as 5.8ms (2.9ms in +2.9ms out) if the CPU >> load of the session your're working on is not too heavy. > > Just as a sidenote: On a -rt system, which is properly setup (irq and > app priorities) and a delta 44/66/1010 you can use periodsizes down to 8 > frames. 8 frames at a samplerate of 48000 corresponds to a (roundtrip) > latency of > > 2 * (8/48000) = 0.0003333. sec = 0.3333... ms > > While context switching overhead gets really huge it is in principle > possible to get ridicously low latency (you really don't want to use a > periodsize of 8 frames though. Even jack idle load is around 20-30% with > that setting -> ugh). > > Operation with 32 or 64 frames per period is possible without problems > at all. > > I don't think this is possible with USB hardware, and i have no idea > whether it's possible with firewire hardware. > > The delta card i use is a PCI card and i suppose in principle the same > should be possible with a pcmcia card (which is afaik just a pci bus in > disguise). > > Have fun, > Flo > > -- > Palimm Palimm! > http://tapas.affenbande.org
