Peter,

In what configuration did you try to sync ?
Did you use the MIDI-CLOCK sync option ?
(Or MTC midi timecode ?)

Which one was set to be 'master' ?

If you want the PC to be master you should use the 'send MIDI-clock' option to the MIDI-port. The 6500 has to follow the MIDI-clock by setting the SYNC-parameter to 'extern' (MIDI-clock)

Andrea (Dreamer) wrote about 'clock' ....
I'm sure he meant MIDI-CLOCK ! Please don't touch the 'audio-clock' parameter in your PC sequencer program !

I never had any problems with midi-clock timing because it is absolute. MIDI-delays (option setting in most sequencers) won't help in this case I think.

Roel