Circuit Bent Casio SK-1 keyboard. I bought this about 6 months ago and decided to sell it. Please see the demo video for more details. Includes everything in picture.

Circuit Bent Casio SK-1 keyboard.

Modifications include pitch select, variable pitch control, reset, OneKey trigger input and an external patch bay with patch storage.

The Pitch Select toggle allows for original pitch when DOWN and variable pitch when UP. This is done with a LTC1799 board for a nice wide range of control. 

Reset is a momentary push button that cuts power. Same as taking the batteries out and then back in. Usually not needed.

The OneKey trigger input allows you to remotely trigger the one key play button. With this you first setup the keyboard to RECORD, play a sequence of keys, back into PLAY, then feed it an external Gate trigger and it will step through that sequence in time with that Gate signal.

The external patch bay has 16 RED jacks that connect to different points on the sound ICs inside the keyboard. The BLACK jacks only connect to the toggle switch for each column. This allows for four patches to be physically stored and played back with easy