I feel the same way...if I had to use an SMF or mp3 I'd quit playing. Seriously!

It may be fine for other performers/entertainers, but, I'm primarily a "keyboard player" and not having as much control as possible (in my case, using a personally made custom style works best) over my song arrangements is not acceptable.

Using a custom style not only allows me the freedom of playing a tune in a different genre and time signature ( i.e. a waltz played as a slow jazz ballad) but I am also able to freely substitute alternate chords (or sub different basslines) further allowing a more persona;l interpretation of a song or piece of music.

Using commercial and/or pre-recorded midi files (or mp3's) isn't conducive to having a unique performance, in my opinion, although I suppose some entertainers are forced to use them in order to please their audience who expect the tunes to sound like the original recordings.

That's most definitely not for me. The purpose behind my purchase of an Arranger Keyboard was so I wouldn't have to sound like the original.

Ian