The famous TB-303 Bass Line Synth.  Original vintage unit produced between 1982-1984. 

Kenton Upgrade kit Installed by professional tech 

More about the mod:

5 Sockets

Kit to add CV / Gate / Filter / Accent / Slide sockets to the Roland TB-303

When used in conjunction with one of our MIDI to CV converters, such as the Pro-Solo mk3, these five additional sockets will enable the synth to be played from a MIDI keyboard or MIDI sequencer.

The inputs are on 3.5mm mono jack sockets which provide the following control:
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)

The kit contains all necessary components and diagrams for connecting the wires / components, and mounting the four 3.5mm mono jack sockets.

Used with a Pro-Solo mk3 this kit will give you the following control over the synth from a suitable MIDI keyboard or sequencer:

Notes – Around four and a half octaves range – (this is not limited by the kit or converter, but by the synth itself)
Pitchbend – range can be set in the converter
Modulation – from converter’s inbuilt LFO. Speed and waveshape can be changed in real time.
Portamento (slide) – rate can be changed in real time.
Filter cutoff frequency – can be controlled using any continuous MIDI controller (cc) or other MIDI message such as Aftertouch or Velocity
Low / High / Recent note priority – can be set in the converter
Single / Multiple note trigger modes – can be set in the converter
Accent – turn the TB-303s inbuilt accent feature on or off using MIDI control
Slide – turn the TB-303’s inbuilt slide feature on or off using MIDI control

*NON-RETURNABLE ITEM