
Converting midi to a module format (mod, s3m, xm...) is an horrible thing too, so don't do that please

However if you want ot do it (why?) mod format give you the worst conversion quality because it don't support some type of effect that midi support. XM instead is the best choice for this operation, but normally you give a file that are very big compared to the midi file.
I only can suggest to search for a good tracker man and tell him if he can write some mod music for your game... I have do that and the result are very, very good
