Hello everybody, I'm the new one. Great site, great video materials from Alan, I really love it!
I have a question about Pro Tools 9, maybe someone can help me.
I'm using PT9 on MacBook Pro. When I record click track internally and compare it to grid I see a big shift... (I'm sending click track to bus and record that signal to a new track). Shift is veeery big and it depends on buffer size. Under Core Audio (Pro Tools Aggregate drivers): buffer size:64, shift is 64 samples, bs: 128, shift is 128 samples, bs: 256, shift is 128 samples (!?!), bs: 512, shift is 256, bs: 1024, shift is 512. I see that in Preferences/MIDI, I can set Global MIDI Playback Offset (f.e. on buffer size 1024 I have to set '-512'), but I really don't understand it! Maybe I'm doing something wrong...? There is no shift when I'm overdubbing audio tracks (latency compensation works good on it).
Any ideas?
Thanks for help!
this is a general problem in any daw. buffer size is a number of samples to be filled in the buffer before played, thus bigger the buffer bigger the latency. remember that there are two buffers input and output and the size you set corresponds for both. so if you set for example 128 samples and record your output then the recording will be 128+128 = 256 samples late without latency compensation.
as I'm not a pro tools user (despite that I own m-audio gear) you need let the daw to compensate for the latency, meaning for daw-output->daw-input you need to compensate the both buffers. so for the 128 sample buffer -> 256 samples compensation. +/- depends of ideology of daw. I like Nuendo - it does it automatically.