To Setup the PCR-30/50/80 to use the OS-X Core MIDI Driver or the Generic Windows Driver, follow these steps, also noted on page 137 of your PCR manual.
1. Press EDIT. The display will indicate 'EDT.'
2. Press SYSTEM. The display will indicate 'SY0.'
3. Use the DEC / INC buttons or the 0-F keys to specify System 6, for USB Driver Mode. The display will indicate 'SY6.'
4. Press ENTER.
5. Use the DEC / INC buttons or the 0-1 keys to specify the USB Driver Mode. 1=Generic OS Driver. The display will indicate 'Gen.'
6. Press ENTER.
Your PCR Keyboard will now use the built-in driver in OS X or Windows the next time it is plugged in.