I've been running into consistent audio crackling problems using the audio input plugin to/from VEP and Pro Tools.
Here is my setup:
Mid 2012 Mac 12 Core with 64 G RAM running Yosemite 10.10.3, Pro Tools 11.3.1 HDX, VEP5 5.4.13741 (running DAW and server on this one computer). My session is 96k sample rate.
I have properly setup the audio input plug in - PT Aux with VEP plugin connected to an instance, PT audio channel with the audio input plugin assigned to 2 channels of said instance, VEP input channel set to the proper input and output, PT Aux set to the proper input for return from VEP. Signal flow is good.
I've tried many variations of the Pro Tools Playback Engine settings, from 128 to 2048. And I've tried many combinations of buffer sizes in the VEP plugin, from none to 4. I've tried different settings of "ignore errors", dynamic plug-in processing and disk playback. I've tried 96k and 48k PT projects and I've tested using the VEP server on a standalone server. Although I've had totally arbritrary moments when audio is healthy, 95% of the time I have crackle.
One more clue: When the PT session is stopped, and I have a 1k signal being generated, audio is healthy, UNTIL I hit play and the crackiling begins.
So, hoping someone out there has figured this out already. Thanks for your tips in advance.