The storing of the left hand voice in the STYLE is discussed in some detail in the PSR-2000 Tutorial lesson on Creating OTS. ( http://pages.prodigy.net/watersj/Yamaha2K/Intermediate/I_AdjStyles/IA_OTS/ia_ots.html )
In the process of explaining how to create OTS, the lesson explains precisely what gets stored where when saving a setup to OTS (and registration memory.)

The similarity of the Music Finder in the Tyros to that in the 2000 is also discussed in the Beginner Lessons on the Music Finder. In fact, this weekend I added screen shots from the Tyros that mirror the functionality of the PSR-2000 screen shots. The record structure is the same, how you load and save mfd files is the same, even the maximum records available is the same (2,500 for both the Tyros and the PSR-2000). By the way, this weekend, I uploaded an even larger master Music Finder database with 2,100 records. I've also provided a Microsoft Word document with the MF song/style/tempo data for those who don't have a PSR-2000 (or Tyros or CVP).

Joe,
Thanks for putting this info up. I'm sure its going to come in real handy when we all start taking del. on Tyros. The pics. are a plus.
thanks, Lou