Ok first to clarify,
Do you have MIDI on these devices? Sounds like you would benefit from both a mixer and sequencer.
Behringer makes cheap Eurorack mixer
For sequencer- you can get a Beatstep Pro and Korg SQ-1 to handle the modular and other gear. These both have CV and MIDI.
That would be the easiest and cheapest route that I am aware of.
BUT if you actually want to sequence and play each track separate you need a more powerful sequencer I think like an Elektron Octatrack, Squarp Pyramid, Social Entropy Engine, or Kilpatrick Carbon!