Just sent this to the abe's, but was wondering if anyone here could help me out.
I'm having some sync problems recording audio from a external synth. Hopefully you can help me trouble shoot this a bit.
-In/Out Sample Rate 44,100, Buffer Size 128, Input latency 3.88 ms, Output Latency 3.90 ms, Driver Error Comp -7.00 ms, Overall Latency 0.78
-MacBook Pro 5,4, OS 10.5.7, 2.53 GHz Intel Core 2 Duo, 4GB Memory
-Energy Saver Settings:
CPU Sleep - Never
Display Sleep - Never
Hard Drive Sleep, Wake for Ethernet, and Automatic Brightness Reduction, are all unchecked.
Motu ultralite MK3, Firmware 1.0.5
Moog little Phatty Stage II, OS. 2.105
Ok my problem is this. I'm sequencing the little phatty via an Ext. Instrument Rack with the native Ableton compressor receiving an input from a kick drum. When I monitor the Ext Instrument track set to auto, it plays fine (in time). When I add an audio track into the session view and monitor the LP it's out of sync each time the note hits. i.e. the note hits about 1/8 of a messure before it should.
I can get by this by freezing the Ext Instrument track and dragging the clip into an audio track, although I have to delete the sidechain compressor for that to work. But the real problem comes up as when bouncing the track via Freeze Track, I have to do all of my LP parameter tweaks with only the synth playing and I can't hear the rest of the tracks. Usually if there is a timing issue I would just realign the start point of the recorded track to get it in time, but I have the LFO of the LP moding the filter cutoff at 1/8 dotted sync. So it makes it a real bitch to warp, also time stretching a bass patch doesn't yield great results for the lower end frequencies.
The only workaround I have found is to set the Driver error compensation to about 49.8 ms delay. Doing that plays both tracks almost in sync, but I can't get the recording to sound the same as how it sounds coming into the Ext Instrument Track.
Also the audio track that is receiving input from the same source has a copy/paste compressor from the External instrument track. But even with all sidechains deleted and the lfo not modulating the filter cutoff on the Little Phatty I still have a timing issue with the audio track playing the synth ahead of the beat. Also the sequence isn't complex at all, it's just two notes, two measures each in one clip.
Also if you made it to the end of this post here's a bonus youtube track to enjoy. http://www.youtube.com/watch?v=8mm_lnHVz4U