It was a bassline valentine. [Custom Keytar TB-303]

YouTube via MrAcidMachine | February 15, 2011 | via this auction
MrAcidMachine on eBay
"A new Roland TB-303 Bassline Clone in Keyboard form, complete with carry bag, guitar strap, and batteries. She was my acid techno love for Valentine's day, but now I must let her go. Fully analog ciruitry. Jacks for CV IN, GATE IN, SLIDE IN, ACCENT IN, AUDIO IN(TO THE FILTER) AND AUDIO OUT. Plus there is a built-in speaker."

Update:

acidkeyzpreview2

MrAcidMachine | February 15, 2011 |

"Keyboard version of a Roland TB-303 Bassline Analog Synth.
DIY Clone of analog circuitry, plus an LFO for modulating the filter and triggering the gate. Too much fun to play!"

accent and slide

MrAcidMachine | February 16, 2011 |

"Just testing various combinations of the accent and slide switches on the ACID BASSLINE KEYTAR!! ON EBAY NOW! WOW! HOW NOW BROWN COW!"

Update:
Details and pics:
"This is a one-of-a-kind custom analog synth. It is a clone of the Roland TB-303 Bassline sound generating circuits plus a keyboard for playing enjoyment and a "TEMPO" LFO for triggering the gate and modulating the filter. Buttons and switches for turning on/off the accent and slide. Switches for Gate-On, TEMPO to Gate, SPEAKER ON/OFF, POWER ON/OFF and WAVEFORM SAW/SQUARE. Knobs for TEMPO, TUNING, CUT OFF FREQ, RESONANCE, ENV MOD, DECAY, ACCENT, TEMPO MOD, and VOLUME. 1/4 inch jacks for AUDIO IN (to filter), CV IN, GATE IN, ACCENT IN, SLIDE IN, and AUDIO OUTPUT. It takes a 9V DC adapter or 6 AA batteries. It has a built-in speaker. Sounds great plugged into an amplifier! Excellent through distortion pedals too! Comes with handmade carry bag and a guitar strap. batteries included."

Update: some more info: "The case was a Casio SA-20 keyboard I found at Goodwill. I modified the headphone/speaker circuit board to be louder/better sounding. Then I hand-soldered prototype boards to create the audio generating circuits of the TB-303. I used some different parts than the original, increased the resonance so it can self-oscillate, added an LFO to trigger the Gate and modulate the filter, and added a circuit to make the keyboard work."