Yeah, I’ve got the Cycles hooked up to a keyboard with the RK-002. It works. It’s pretty cheap–about $70 for me including tax and shipping to CA. But it’s a work around. Since it just cycles through the MIDI channels, you can have notes cut off even if you’re playing six or fewer notes since it might circle back around to a note still being held. Maybe if we’re good Elektron will introduce a poly mode in a firmware update though.
I bought the Cycles because I wanted a drum machine and a sketch pad. This is more like an extra thing it can do. It’s also fun throwing extra lfos from the Digitakt to see what kinds of sounds I can get. If you’re just looking for something to play polyphonically, this probably isn’t what you’re after.