For all having the same issue, this is what worked for me - I suppose (definetely not sure) the onboard audio card has a big latency, and adding extra buffers and network buffers are contributing to messing up the things:
Logic Pro Settings: I/O Buffer Size: 1024 // Processing Buffer Range: Small (512) // VSL Instance: 2-3-4 buffers (still experimenting with these - 0 buffers put a lot of stress on the CPU). These values allow me to send 16 stereo channels for summing on a slave VEP Instance, and at this point I am sending MIDI to 6 VST instruments on the same slave (different instances) but this doesn't seem to impact the latency compensation.
Hey all, I purchased VEP6 few days ago, read a little bit the manual and then all the threads I could find on latency compensation issues.
I have this simple project, see the attached image: basically a click track which sends a click sound on two Auxes. One Aux is going straight to stereo output, the other one is going to an VEP instance which has an empty Master strip which receive the click on IN1/IN2 and outputs the click to OUT1/OUT2 and this gets back on the "Click Return" strip in Logic Pro.
In Logic I have the IO Buffer set to 1024, onboard audio (macOS Sierra, i7 16GB DDR, LPX 10.2.4), process buffer range set to Large. On the slave (Win7, i7, 8GB DDR) VEP reports Plugin Latency Compensation 0 with empty strip and starts growing if I add insert plugins.
The purpose I've purchased VEP6 was to run heavy instances of Serum synth on the slave and submix and process the stem tracks (drums, synths, vocals, fx) and return everything to stereo output and for the moment I found no ways to keep in sync everything.
Apparently all the MIDI I send over to a instrument loaded on slave VEP, comes back as generated audio signal in perfect time. But anything I send using the Audio Input plugin, comes back probably with half of a second delay. I've noticed that the level meters on the slave are pusling on the same rhythm so the input signals arrives in time. So the problem is on the return channel (Vienna Ensemble Pro plugin).
Any ideas to sync them up? Do I do something wrong? Same thing happens with Ableton Live and same thing if regardless if I use 32 or 64-bit server or if I use a localhost server or a networked one.
Edit: direct link to the same image: http://imgur.com/a/SW9ES