Jukka
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This specification has to do if you are using the scope to plot voltage levels versus time. To do the drawings like you’ve seen above you need to use the scope in the X Y mode. Think of it like an Etch-A-Sketch, with two separate signals going to the two knobs. What gets drawn on the EAS has to do with the rhythmic frequency relationships of the two signals.
What you’ll want to feed the X an Y are signals much less complex than music, or all you’ll get is a hash. But you also want feed it something more complex than two harmonically related sine waves, though that’s fine, you’ll get a nice lissajous pattern from that. If you have one signal that is varying at audio rates relative to the other, that will allow you to paint interesting images on the screen. Patching modular gear is one way to generate two signals with unusual repetitive voltage relationships to each other. Adding some noise to a signal fuzzes stuff up and paints more solid regions.
Modular simulators like VCV Rack is another, and you can use the scopes built in to that software. Plus then you can add color to it all, check out this video:
BTW: 15 MHz is 15 million cycles per second. That’s the rate the scope is able to distinguish. Audio goes to 20 thousand cycles per second. Big difference. So to see a wave on an voltage-time plot you turn a dial on the scope to slow your display rate way-way down.
ADDED: Another way to generate these sorts of images is to use a spread sheet and somehow (it’s up to you how) generate two columns of numbers that have a relationship to each other and plot that in XY. It’s basically the same thing, just done in different way.
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