[linux-audio-user] Re: linux audio interface

[cezar at mixandgo.ro]

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 at gmx.net> writes:

> On Fri, 05 May 2006 00:51:49 +0000
> Cesare Marilungo <cesare at poeticstudios.com> 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