As far as new devices go, the aforementioned Keystep fits the bill perfectly. I have one and I use it to control a Volca FM and a Volca Bass. I use this to avoid cable swapping.

https://www.amazon.com/gp/product/B01M3RH5GI/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1

The set up is perfect!