Hi all,
Long time no see. I wanted to drop by and give a heads up on a circuit that I'm working on. It's a sequencer for SK series casios, though I've tested it with a few MT's as well. I suspect the bottom end of the keyboard matrix is probably the same on all the casios of a certain vintage.
I'm using a 40106 to create a clock signal (then another couple pins there to invert it), a 4040 to have the option of dividing the signal, and a 4017 to create the actual sequence. Here's a link to a video of an early prototype working with a sk-5. Sharp observers will also recognize Graham's Slo-AD mod in there.
https://drive.google.com/open?id=0B9i2z8eh5tj0MGVmT3NweldKdm8 
In this version there are relays, rather than 4066's, which are what I have now. They connect to the keyboard matrix Once I get it off the breadboard, the plan is to have a patch bay, so you can patch any note into each of the eight steps. Also, you can use the outs of the 4040 to send divisions of the clock signal to anything you can find that is triggered by 5V. I've had luck running it to speak and spells and to LFO's in other circuits. The schematic below is a rough sketch off the top of my head, as I am at work right now, but I think it's correct.
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Topic: Casio Sequencer (Read 5217 times)