Hi guys, remember me and my bold 'quality of sound' statements? Well I'm making a NEAR full retreat! I've been working on my mp3 set up with On Stage Performer. Well the OSP is great, but this is my experience with mp3 backing tracks, and anyone can fight me if they think I'm wrong: You lose definition. I've been using the Tyros for over 2 years, and I can tell you the definition and separation of sounds is much better from the Tyros. I can't tell you why, but something happens in the render prosess that makes midifiles play better and sound better on the Tyros, than top quality VST's rendered to mp3.
I've done lot's of A/B comparison, believe me.
NEAR because:
Some songs however will never sound good as a midi file, for example Dire Straits melodies, and other songs with lots of dynamics and guitar based. Don't get me wrong, live recorded is always best as far as the sound of the instruments, but to play as mp3 through a PA has not impressed me. I'm back to the Tyros for back up for nearly most things:

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Roy-Andrè