I think it is possible but you would really should be talking to Bif.
I think you will find that Bif's coupling incorporates a buffer clash AND a coupling sound on the one sound slot.
So as the shuffle (F21) is pressed you will get the coupling sound, then when it moves you will get the buffer clash I THINK.
Best speak to Bif, he does not bite, not on weekdays anyway.
Wiggy.