"Frusciante extensively used his Clavia Nord Lead 2, a Casio SK-1, and the Akai MPC3000 on the album To Record Only Water for Ten Days. Other electronic instruments used during Frusciante's recent recording spree include a Chamberlain, a Moog Voyager, an Arp String Ensemble, a Korg MS10, and a late-1970s Synare analog drum synthesizer."more
During a November 1997 interview with Sound On Sound magazine, Autechre talk about the internals of their Casio SK-1. "See this chip here? If you connect any two of these points together, it crosses the samples together. You can get ring modulation, flangers, delays, and all this other timed-based stuff. So we're going to try and get a switch fitted on the back that can move across the points, that way we can adjust it in real-time in a live situation." via [Sound On Sound](http://www.soundonsound.com/sos/1997_articles/nov97/autechre.html)more
The Casio SK-1 is presented front and center on Soccer Mommy's "Collection" album artwork. [Pitchfork Review](https://pitchfork.com/reviews/albums/soccer-mommy-collection/) "An occasional stab of synthesizer is the closest these songs come to pomp, and the production is still scruffy around the edges, hi-fi only by the standards of her early self-recordings."more
I've been looking for one of these for a few years now, ever since I heard the music in Homestar Runner was made with one, but the prices on Ebay and Reverb are just way too high because of circuit benders and hipster indie bands. 75 dollars for one of these is fucking crazy, but if you can find one at an antique/thrift/junk shop, get it! The built in sounds are pretty typical of kids Casios from this era, but the sampler is so crunchy, it's great. It only has about a second and a half of sample time, but if you pull the classic SP-1200 trick of speeding a record up to 45, you can just barely fit a drum break in there, which sounds great under house drums, a la Fresh & Low's Wind On Water (https://youtu.be/e1X59TH8IxI)
This was a steal at a local thrift store. I originally intended to circuit bend it, however as I played around with it I found it has great capabilities in it's original form. The sampling function is probably my go-to use for this instrument, but the built-in effects, "sound design" option, and present voices are worth exploring as well.