LF Midi over USB programmer $$$

I'm working on a new project and need to get a prototype out ASAP. What I need is a very simple code.

I have 2 "buttons" that I need to function as a input into MIDI on a PC through USB.
As in,

Hit button one > plays sound 1 on PC
hit button 2 > plays sound 2 on PC

This is what I need ATM and will pay for. After the prototype is done with this code I will be able to collect more funding and will continue to work with you on expanding the code to something like,

Hold button 1 > continue to play sound on PC until released

But for now I just the the basics. Also needs to be able to respond quickly. Possibly up to 4 hits per second. So no "read" just respond i guess? if that makes since.

I can pay 20.00 if thats enough?