I'm using 3.1 and the drumline sounds are lagging behind the pit sounds...How can I fix this?

This has something to do with your system. In order to work on an answer to your question, please supply some specifics about your setup such as:

Where are your VDL1 sounds being generated from? (soundcard, giga, reason, kompakt, kontakt...)

Where are your PIT sounds being generated from?

Have you attempted to adjust the audio settings for your playback device? Any info on those settings might help.

Computer configuration (mac or windows, RAM, what type of soundcard, etc)

Working thru Kontakt. Pit sounds are running from Microsoft GS out of Sibelius....I can try and figure some other stuff out