IBM ThinkPad 755CX Manual page 262

Advanced Information for Audio Function
246
IBM ThinkPad 755CX User's Guide
Pan The Mwave feature's MIDI synthesizer uses QSound
to implement pan. By using QSound, the position of
each channel's instrument is not limited by the
position of the speakers. It is received on control
number 10.
Vibrato Also referred to as modulation , this control produces
rapid, small changes in the pitch of a note and is
usually controlled by a thumb wheel on a MIDI
keyboard. Vibrato depth can be varied 2 semitones.
It is received on control number 1.
Sustain Each note of an instrument has an envelope that
describes the loudness of the note during attack,
decay, sustain, and release periods. Some MIDI
keyboards can be used with a pianolike sustain pedal
that prolongs the sustain period to mimic holding a
note. It is received on control number 64.