Roland TB 303 with 5 Socket Kenton Mod

Note: Auction links are affiliate links for which the site may be compensated.

via this auction
"Comes with an installed Kenton mod which adds sockets for:
CV - provides Volt per Octave control over the oscillator frequency
Gate - controls when notes play (0 volts = note off / >3 volts = note on)
Filter - controls the cutoff frequency of the low pass filter (from aux out of converter)
Accent - turns on or off the accent feature (0 volts = accent off / >3 volts = accent on)
Slide - turns on or off the slide feature (0 volts = slide off / >3 volts = slide on)

It also comes with the Kenton Pro Solo control box which is the hub in between your DAW and the TB 303. This way you can control the TB 303 from your computer iu ways not possible just using a 303 as stand alone."