I just found out yesterday
that Native Instrument's Kontakt player allows you to use alternate tunings, and has five or six presets, along with the ability to use any Scala tuning files. In addition to Just Intonation, they offer Pythagorean, a few obscure tunings, and of course, 1/4 Tone tuning, which is what I used here.
Listen to Tuning Troubles here.
Track 1 is the electric piano,
Track 3 the electric bass, and Track 4 the organ. All of these play the same progression, with the bass just playing the chord tones, and the organ playing two octaves up (technically 4 normal octaves, but with 1/2 tones its 2). I am not particularly skilled at writing with 1/4 tones, but I tried to make this kinda dark and creepy, which I think generally works.
Tracks 1 and 4, with 3 using just the lowest notes.
Tracks 1 and 4, with 3 using just the lowest notes.