Modified Casio SK-2
Modified Casio SK-2 - You more commonly see the SK-1 modded. The SK-2, which is rarer, seems to be avoided by a lot of circuit-benders. That's not to say it isn't bendable. Not as bendable, perhaps, but bendable nonetheless. Here are the schematics for these mods.
It was immediately evident that a patch-bay was in order, for the number of bend combinations on the large ICs was innumerable. I'd never attempted a patch-bay before, but was confident enough to give it a go. I also looked about for pitch modifications, and while there was no way to pitch downwards (which is always more interesting), I found some pitch & tempo points which surpassed the range of the keyboard and already-present tempo select buttons.
Having prepared 28 lengths of thin solid-core wire (I usually use stranded), I next prepared myself for the most nerve-wracking part of the build: hooking the jacks to the IC pins. It went surprisingly well once I got into the rhythm of things. I tested now and then just to make sure I hadn't killed the unit with excess heat from the soldering iron.
Success! All that remained was to fit the reset switches and an output jack. I didn't keep track but the build took approximately one evening and the better part of the next day. I'd intended to do it in dribs and drabs, but, as usual when I'm circuit-bending, once I started I became obsessed with getting it finished.
Oh yes, I also built a switch box with four leads for connecting patch-bay points. Each lead has an on/off switch, an interrupt switch, and a 100 ohm resistor to minimize stress on the circuitry. The box came with wood-screws in it: $1.50 at the local dollar store.
|Alien modem||A snippet of glitched-out weirdness.|
|Demo song + pitch/tone||The demo song, which I've now heard more times than a person should, being cranked through the pitch/tone knob.|
|Hyper demo||The demo song dropping out of warp speed via the pitch/tempo knob.|
|Crazy band||The demo song again, now almost unrecognisable as the A.I. band begins to improvise.|
|Flute + envelope, part 1||The flute tone: the first few notes are raw, the rest have envelope mode engaged.|
|Flute + envelope, part 2||More of the same, with a touch of pitch shifting at the end.|
|Flute + envelope + pitch||The flute tone sounding very high indeed.|
|Piano + envelope||The piano through the envelope mod this time.|
|Sample mangle||This is what happens to samples when you turn the dial to "mangle."|
|Mangled sample + env||This is the same mangled sample heard above, through the envelope mod.|
|Pitch loop||A stalled bit of audio data, with some pitch shifting.|
|"Pop vweep"||Similar to the above.|
|Rhythm glitch||Trust me, this isn't a standard rhythm on this machine.|
|Traffic noises||Glitches somewhat akin to synthetic traffic sounds.|