On Mon, 2010-07-05 at 10:47 +0200, Ralf Mardorf wrote: > On Mon, 2010-07-05 at 10:33 +0200, Arnout Engelen wrote: > > On Mon, Jul 05, 2010 at 10:25:23AM +0200, Ralf Mardorf wrote: > > > So the visually test around 4 ms and ALSA MIDI latency test around 4 ms > > > from today might be correct results for my computer > > > > That sounds pretty good then. > > > > > and at least when I got 4 ms for the visually test, the audible result > > > was > > > unusable for music, anyway, I still have got some hope. > > > > You might have mentioned it before, but how exactly are you performing your > > test of the 'audible result'? > > > > > > Arnout > > The hardest test is to record a MIDI groove for kick, snare and hihat. > > I then used my Alesis D4 drum module that don't cause audible jitter > when using it with the C64 and Atari ST. > > I did record the audio output of the Alesis D4 by Linux, but each > instrument one after the other, each instrument two times. > > The result: > > Playing one recording of the two recordings for each instrument and the > groove is broken. It doesn't matter if it's a beautiful McCoy Tyner or a > stupid Madonna like groove. > > Playing two recordings, but just of one instrument the phasing is not a > constant phasing, but fluctuating. An early reflection similar effect > usually isn't the result, but in the worst cases even this is possible. > > Ralf
C64 synced by click and Atari ST synced by SMPTE and the recordings done by a Yamaha MT44D 4-track cassette recorder a groove wasn't broken and the phasing was fixed, absolutely constant. Using the same Alesis D4. _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
