Daniel James wrote: > Hi Ralf, > > >> Btw. to the list and off-list more and more people subscribed to LAD >> experience MIDI jitter on modern computers for every OS. >> > > You're quite right to keep mentioning this issue, and I do appreciate > the time you've put into testing to prove the point. > > >> OTOH using the >> rtai kernel patch, controlling CNC should be possible without micro >> controllers. I wonder if Linux audio is using the best rt patch, resp. >> if it's possible to use the rtai patch for audio too? >> > > That patch is not something we've looked at yet, but I'm sceptical that > the realtime kernel is the cause of your MIDI problems. If they got this > right in the 80's, on computers which could not do anything near > realtime audio processing, then I think it's more likely to be a > question of MIDI application design. Have you tried running the test on > Ardour 3? >
No, I should compile Ardour3, but ... > Also, we have less on-board MIDI controllers now, and more USB, which I > suspect might be contributing to the problem. > ... I suspect my USB MIDI device. Unfortunately I didn't get the MPU for my Terratec 24/96 working until now. I'll mount my older PC again. This older motherboard has got a MPU for the 'game port' where no external opto-couplers are needed. > Looking at the thread here: > > http://forum.cakewalk.com/tm.aspx?m=1178006&mpage=3 > > it seems that Logic 5 and Logic 6 had tight MIDI timing, but in Logic 7 > it got worse. Other proprietary sequencers are reported as having really > bad or variable jitter. > > Have you seen this page? http://openmuse.org/transport/fidelity.html > > See also this IBM paper from 2001: > http://openmuse.org/noncpl/MIDIWAVE-ICMC2001.pdf > > Cheers! > > Daniel > I'll read it tomorrow. It's said that Nuendo should be ok, resp. even for Nuendo there should be some limitations for external MIDI equipment, but IIRC it's said that there should be less jitter to be fine with a recording, when all external MIDI instruments are recorded at the same time. Logic today is for MacOS only. I'm just interested in Non-Apple PCs, so for tests Windows apps are welcome. Currently I don't have a Windows install, but I had one on my machine and even if there was less jitter for Windows, it was too much for external MIDI equipment too. To be continued ... Ralf _______________________________________________ 64studio-users mailing list [email protected] http://lists.64studio.com/mailman/listinfo/64studio-users
