adding a tone pot to a volume pedal?

[scott_v]

First off i made a simple stereo volume-like pedal using parts from a broken Digitech pds pedal.  it has one input and two outputs where each has a volume control (i used 100k pots).  To increase its capability I'm wondering if its possible to add a tone control pot to each of the outputs, meaning what pot rating would i use? 10k, 25k or 50k or and would guess i also need a cap on of rating .333 uF or .1 uF or Also need a hint on how to wire the tone pot, i think i only need to use two of the three pin points, point 2 would have the cap on it?

thanks,

Scott