Noodle Rider from Nudlhed
Four track cassette player, with CV / MIDI speed control, and four VCAs for selective gating or enveloping the tracks with CV or MIDI.
There are three separate parts shown in the picture, all in Eurorack, the tape playback, the VCA sidecar, and the enclosure.
You need to record the four track cassettes in a separate device, that you supply.
Yes, of course, there are non-mechanical ways to do similar things.
For those with some Eurorack stuff already, the four track speed controlable playback part would be useful on its own.