I used the C Harmonic Minor scale for most of the song, using all four instruments, and I personally thought that my tune came out very Indian indeed. In my opinion, when sequecing in midi, you can do anything, as the instruments are only patches, not counterparts of the real thing. Though I could just as easily play a pentatonic or harmonic minor scale on my own trumpet and make it sound good. In fact, I do that quite a bit for warmup.