The Mellotron Group

10k Audio should do it. Attach to 1 & 2 or 2&3 depending on pot  
orientation.
 
Frank
 
 
In a message dated 12/31/2010 3:01:00 P.M. Eastern Standard Time,  
nik.hewitt@virgin.net writes:

What  value pot do I need? Does it matter?
2) Which contact on the jack-plug  connects to the wiper of the pot? I 
don't care about the connections to the  pot's end-stops, as I propose to use a 
2P2W switch to reverse the pot action,  so they will go to the remaining 
plug  contacts.