HP 700 Series - Manual (Page 34)

30 HP Jornada 700 Series Handheld PC
When an audio file is being played, appointment notification
will not sound (even if sound and reminders have been set in
the control panel), however, the appointment notification light
will still flash.
When playing MP3 music files through the HP Jornada built-
in speaker, reduce the bass setting. See Setting bass and treble
levels in Chapter 7.