I had been using my virus snow with Logic 8 on a macbookpro OS10.4.11 The virus control was V3.
With this set up, using the USB inputs, I had zero latency. If you zoomed in and looked at the wave, there was one sample between the start of the beat and the start of the wave. One sample - one, 44.1 thousands of a second. Perfect.
I tested this a number of times when changing my audio buffer, or when going from 16 to 24 bit recording.
It was nice. Clearly Logic's PDC was talking to the Virus Control properly.
Now I'm using pretty much the exact same set up, but on a newer computer that has Snow Leopard.
Also, I had to upgrade to V4 of the Virus Control.
Now I'm getting exactly 128 samples of latency - every time. My audio buffer is 64 by the way, not 128.
I know that it's very miniscule, and some people would kill to have that kind of latency, however I know that Logic can talk to the Virus and use PDC to ensure near zero latency, so I want that back.
Has anyone else tackled this issue?