So I want to make a drum MIDI with Tuxguitar. How would I apply samples to the MIDI and where can I get good free samples?
tuxguitar uses generalmidi sounds. If you want other drum sounds, you need a DAW/softsynth program.
Ya thats what I was asking. I already have a DAW (Reaper) so whats free that I can use to replace the drums sounds?
Use a Drum sound on reaper, and import the midi you made. You may have to drag each element (snare, crash, bass, etc) to a different note on the piano roll so that it will play back correctly. If you need a drum sound, you can use something like this: http://www.meldaproduction.com/mdrummer/