Studio-recorded? Where might I find these? Most of the older mp3's I've heard are actual recordings with the vocals masked out. The newer ones are midi transfers into WAVs or mp3. With the exception of maybe using less equipment, why would I want to convert my midis to mp3? It seems like more work up front to eliminate work on the job, but work that is visual and supportive of the presentation on stage (am I making myself clear?).