2 channels crossfaded by a foot control

[David-san]

There is a Scriptlet that could be slightly adapted and help you:

[Gig] X-fader - crossfade two volume parameters

A Scriptlet which operates a crossfade of two volume parameters (selectable transition types: linear or constant power, adjustable auto crossfade time). [Crossfade] How to use: insert the Scriptlet somewhere in the rackspace where it is needed (no particular conection required) insert the built-in “Audio Mixer (4ch)” plugin which will be used for crossfading insert 2 slider widgets respectively assigned to the Volume 1-2 and Volume 2-3 parameters of the “Audio Mixer (4ch)” plugin insert a b…

It was especially made for the constant power mode (reduced overall volume change while cross fading).