Actually, I was looking for this information for 3 years!...now thanks to you, the manual is on my hands and of great help, cause I understand now where I was doing wrong connections and wires...excellent, I'll be back to you if in need, thank you.
This manual covers the main equipment features only. While it also includes the procedure for saving and loading from the now long obsolete memory cards it does not mention the how to operate with the optional floppy drive interface so I am still at a loss about how to use this! Note that there is a separate manual covering the MIDI interface and programming via the keyboard, not included in this download. You will also need to get hold of this if you want to use the MIDI interface properly. Basically there is little difference between this manual and the free to download manual for the similar PR60 model.
Text excerpt from page 86 (click to view)
Setting sounds
You can adjust the volume level of the system sounds, alarm sounds, and game sounds or turn the sounds off completely.
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Tap the arrow V in the top right-hand corner of the Preferences screen and select General.
The General Preferences screen is displayed.
Tap the arrow V next to System Sound and select the desired volume level or Off.
When the System Sound is turned off, the chime tones associated with the HotSync® operation are also turned off.
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Tap the arrow V next to Alarm Sound and select the desired volume level or Off. Tap the arrow V next to Game Sound and select the desired volume level or Off.
The Game Sound setting is only applied to the games programmed to respond to this setting.
Customizing your Sony CLI�� handheld (Preferences)