Thanks for the reply!

I'm using M-Audio evolution MK-461C 61-Key USB MIDI Controller.
Connects via USB... wink

I've done some more playing around, and if I use:
1. Right-click on the "Thru" channel -> "Select MIDI Patch" -> and then select one of the "favorite Patches": then I can hear all notes I play.

But if I use:
2. Right-click on the "Thru" channel -> "Select Hi-Q MIDI Synth Patch": I can hear no more than 4 notes simultaneously.

I tried switching between "CoyoteWT" and "SampleTank 2.x" and both have the same results.

Is there some kind of setting I can try to change?

Thanks,

Ariel.