Before you install the PCR-1 you must check to see if the OS is above 3.0 and the Boot Block is above 2.0.  If the OS is lower than 3.0 you must also update the soundware to 3.0.  All these files are on the CDROM that come with the the PCR-1.  They are MIDI files and you will need some kind of sequencer to play them into the keyboard.  If unit does not have the requirements the new sounds will not be accessible.  There is a very good Procedure is the installation manual.

abridged procedure:

1.  Check OS for 3.0 & Check Boot Block for 2.0.  

2. update what ever needs to be updated via any MIDI sequencer.

3. install ROM

4. Decide if you want Orchestral set or GM set.

5.  Load Orch. set or GM set via MIDI sequencer.  

6.  Hard Reset the unit.