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
