The OTS is, indeed, saved in the style. So, on the PSR-2000, if you change the OTS settings, you need to save that style and you can save it to the USER memory or to a floppy disk. If you are only interested in changing voices, you can save your settings to a registration file which uses the internal style and includes whatever voice settings or changes you want. A registration file will be much smaller than the style file.
_________________________
Joe Waters
http:\\psrtutorial.com