> For testing purposes, try MME and see if your results are the same.

I've unplugged the behringer usb audio device for this test, since it works with Asio drivers only, and used the headphone output of my laptop. Set audio drivers on MME:

- With vst/dxi synth activated, first instance plays well, second instance doesn't play at all (thru channel)

- With vst/dxi synth off, and using regular midi sounds, again i got on second instance the same sound of first instance.

Will do further tests today and let you know.
Thanks for now