Roland TB-3 over USB causing sync/playback issues

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Thanks for the help. I don't have anything else plugged in other than what I mentioned above.

I think I figured it out, by the way. I went into the settings and disabled the note messages for port D -- it now works just fine and is perfectly synced. I'm still a bit unsure as to how it was caused though - the TR-8S isn't sending any note messages over MIDI (or none that I know of anyway), so I'm not sure why the TB-3 was behaving as though it was getting two note messages (one from the internal sequencer and another from... somewhere?).

In any case, it seems as though all is well. Thanks again for your help!

I seem to have exactly the same on my TB-3 ! 
With the PSU or USB battery pack it works but if plugged to any PC (I even tried Android...) it stutters during playback.

But I did not understand how you fixed it: which exactly are those note messages you disabled? For port D?
Any drawbacks? 

Thanks in advance if you could help out!
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