Under general preferences for sound & alerts, application "general", I have system volume to "off".

Ever since I turned on bluetooth & paired the phone with my Garmin GPS, the sounds for every keytouch is back. The preferences still show off.

I've rebooted, sounds are off. Re-pair with the garmin, sounds come back on. Even the really loud one to indicate that sync is complete.

Preferences still show sound should be off.

Any clues on what's going on?