Sparkle Drive Clean Knob?

[sixstringslinger]

I'm wanting to mod my TS5/808 in a new enclosure to add the Clean blend like on the Voodoo Lab "Sparkle Drive".  I'm assuming that the knob is a pan pot between the buffered clipped and unclipped signals on a TS808 circuit going straight to the volume pot.  Does anyone have one or know what value pot/components and where to tap into a TS circuit to add this circuit?

[cd]

IIRC the signal is split off the first transistor stage, then it's mixed with two resistors (dual ganged pot) into a unity gain stage.  The volume control is moved from a voltage divider off the TS tone control stage to another op-amp voltage gain stage.