What is your issue with the Micro Pro? I think its probably the most reliable/tested/relatively-affordable all-around 1-stop solution for this purpose and the maker is constantly updating it and offering regular help to users with his products. Other than that, some users have had luck with the M-vave Chocolate (the wireless bluetooth also happens to work as the necessary USB Host for the Spectrum), if you want to get the cheapest possible solution that probably also offers little to no user support. Not many other MIDI controllers in this price-range have the built-in USB Host ability that you need to communicate with the Spectrum via USB, so you would need a third device (either a Neuro Hub or the new 1-series MIDI dongle) in between. FWIW, I had one of the larger DMC controllers paired with a C4 and it was ridiculously easy to use with minimal programming necessary for basic preset toggling. I upgraded to a Morningstar controller for more complex control, but the DMC stuff is fantastic for as close to a "plug and play" experience that you'll find for SA pedals IMO since the necessary device MIDI profiles are all in the included firmware already