Fairly new to Vienna, I set up an effects template with VEPRO and Studio One 5 for the first time yesterday, and I had an interesting evening with lots of crackles. Eventually, I realized what was going on, and so I'm sharing my experiences here, in case anyone should encounter the same problem. I didn't find any other posts with this specific issue:
I set up my reverbs, delays and whatnot in VEPRO and connected to Studio One without any issues. But when I started adding eq to the bus channels in the DAW, I got what appeared to be inconsistent crackling across the board.
Not a buffer issue, in my case this happened with the Waves SSL E-Channel and Pro EQ with the “High Quality” box enabled.
As it turns out, the problem occurs when I put these plugins between two channels with VEPRO sends. So, as a result, I always have to put these eq's at the start or at the end of the chain. Some other eq's worked fine all over the place.
It isn't too much of a bother - the only downside I can think of is that I can't, for example, add these eq's to an “ALL DRUMS” channel with a VEPRO send effect on it - instead, I have to route the channel to a clean one and add the effect there, as shown in the attached image.
I'm no expert, and there may well be a good reason for this behaviour - but it took me a while to figure it out, so hopefully this will be helpful to anyone finding themselves in a similar pickle.
(I'm attaching an illustration of the problem with the SSL as an example, just in case my explanation was confusing):
