I'm having trouble keeping Virus TI synced with my host. The attached image pretty clearly shows the problem. The synth may be playing in time for awhile, but given a pause (e.g. a measure without any MIDI being sent) it quickly gets out of sync. The first MIDI note after that pause will be out of time, and then the Virus manages to get itself back together. Tips, thoughts?
(The Virus is connected directly by USB to my MacBook Pro and is being used as a synth only, not as an audio interface.)