M-AUDIO M-Track Duo USB Audio Interface for Recording, Streaming and Podcasting with Dual XLR, Line and DI Inputs, plus a Software Suite Included

I just went through all this myself about a month ago, it's pain but worth it! So, not sure what kind of keyboard you have but it sounds like it either doesn't have MIDI at all, or it's a USB MIDI maybe. You can find cheap USB MIDI keyboards online that will work but then you'll need what's called a USB MIDI host - https://a.co/d/044Yrind so they keyboard can communicate with the synth. The 1/4" to MIDI cable you have should work after that. The other comment below has good info on a USB audio interface, this is the one I have - https://a.co/d/07dzGVW8 . If all you're doing is recording the UB-1 micro then there's cheaper ones you can get.