Yes I do know a MIDI fader controller, that is *very* inexpensive and even has motorized faders:
The
Behringer BCF2000.
I'm not having shares in Behringer, trying to sell, or anything like that, but in my opinion this still is one of the most inexpensive fader MIDI controlers with high fader resolution you can get!
I wrote some code to write/read the data from this fader panel. Usualy, MIDI faders only have a resolution of 127 steps (7 bit). For music production this often is enough, maybe in your case for games too, but for our purpose we needed more.
The advantage of the BCF2000 is that you can send messages to setup each fader's resolution, up to 14 bit (16383 steps)....
Also you can set the BCF to output a message each time a fader position is changed.
regards,
mcduck