Hello and thank you for your reply.

Here is the patch: A-145 sine > A-105 FCV2> A-105 output > A-138 input 1 set at seven > A-138 output set at seven > Audio interface.

The A-105 freq is set at the five mark and I sweep the FCV2 pot up from zero to ten. The sound starts to appear at around the three mark - but, earlier if the freq is lower.

Here is the Soundcloud link -
A-105

 

Thank you  and best wishes.