If you reread my last post, you will see that you have to obtain the control- a stereo potentiometer and then wire it as a stereo rheostat.
Radio Shack used to sell just the thing for about $5.00; this one should do nicely:
http://www.ebay.com/itm/2x-ALPHA-C100K-100K-ohm-Dual-Stereo-Potentiometer-Log-Taper-pots-20mm-shaft-...
Radio Shack used to sell just the thing for about $5.00; this one should do nicely:
http://www.ebay.com/itm/2x-ALPHA-C100K-100K-ohm-Dual-Stereo-Potentiometer-Log-Taper-pots-20mm-shaft-...