PLAN B analog blog

A tip:

While the final offset pot of each processor is a powerful tool for
changing the phase relation of incoming AC signals, it can add a DC
offset...that's what that control does.  Xfading from a source with no
DC offset to one that has one will produce a 'thump' sound somewhere
in the travel of the pot (or xfade induced by a control voltage) when
the xfade jumps form ground as reference to something other than
ground.  The larger the offset, the louder the thump.  Your Model 14
ain't broke...you're teling it to do that via control settings. 

If you hate that, then you'll have to remove of the DC offset by
making sure the offset pot is set to the center positions on both
processors so that both LEDs are unlit WHEN NO SIGNAL IS CONNECTED TO
THE INPUTS.

Once you do that there will be no more thump.  A virtual thum-be-gone.

- P