I would guess the midi is going into the QS from the keyboard, going out to BiaB, and then from BiaB back to the synth again creating the echo (and back from the synth to BiaB and back again); a midi loop.

Can you connect the keyboard to BiaB input, then connect BiaB output to the synth? That way the 'midi thru' of the synth is eliminated, thus eliminating the loop.


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