IAC timing OS X
Jun 14, 2007 at 3:27am
IAC timing OS X
I’ve heard that the IAC timing in OS X was terrible, and it seems to be true. Ive been trying to makes some sequences using a hostphasor~-bang patch that generates midi data with makenote –> noteout–>IAC into Logic 7.2 and its barely working.
I cant get over how bad the timing is. At first I thought it was max, but I did a simple test. I created a scheduler-triggered 100khz “blip” and set it to trigger at 64th notes at 175bpms. Using a rewire return, I recorded the output into logic. The sync was shifted slightly, but once I but the first moved “blip” into place, each little blip after that fell exactly on a 64th note in logic’s timeline.
However, if I do the same thing, except using hostphasor~ to trigger midi notes and send them over the IAC bus, the timing is so incredibly bad. The 64th note rhytm comes in little jittery bursts.
I was wondering if anyone had any experience working around this. I’ve tried finding 3rd party os x software to route midi but I haven’t found anything.
Here is my test patch to illustrate the problem-
Jun 17, 2007 at 12:32pm
MIDIPipe is at this link if you want to give it a go.
Hope this helps,
Jun 17, 2007 at 3:59pm
There is midishare also:
I know openmusic from ircam uses it to route midi information, it’s working
On 17/06/07, Mitch Turner
Jun 17, 2007 at 5:31pm
Thanks for the feedback. I have tried midipipe, but it uses the same IAC bus to route data. I will give this midishare a shot though, and post the results. In the mean time, I’ve been using vst~ and just recording the output into logic via rewire. The timing has been spot on in these cases.
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