I created an open source (free for anyone to use any way they want) project to connect an expression pedal to the BeatBuddy MIDI Sync Cable. Here’s my blog and video demo:
http://www.mikesmicromania.com/2015/01/beatbuddy-tempo-pedal-midi-beat-clock.html
Note to forum moderator: this is just a blog, I have nothing for sale on the internet. I’m just a hacker/maker trying to share stuff that works