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MIDI Messages Used to Control the GS Sound Source
There are many different types of MIDI messages.
Those described below are used to control a GS sound
source. All of them except for System Exclusive
messages affect a specific MIDI channel (and,
therefore, a specific Part).
Note On Messages
These messages tell the PR-300S which key has been played
and how hard it has been struck (at what velocity). When a Note
On message is received, the appropriate note in the sound source
plays. If, however, the key played is outside the recommended
sound range (as shown in the "Tone List" found at the end of this
manual), the note may not sound or may sound at a pitch other
than the pitch of the key played.
Note Off Messages
These messages tell the PR-300S when a note has been
released.
When a note off message is received,
the
corresponding note played by the GS sound source is stopped.
Pitch Bend Messages
Pitch Bend Messages cause smooth changes in pitch to
occur. Pitch Bend Messages are usually sent by a pitch bend
wheel or level on a keyboard.
You can select the amount of pitch change which occurs
when a Pitch Bend message is received by the GS Sound Source.
After Touch Messages
These messages are controlled by the amount of pressure
exerted on keys after notes have been played. There are two
types of After Touch: Channel After Touch, which affects the
entire Part, and Polyphonic After Touch which affects each
individual key. Normally, the GS Sound Source does not
respond to After Touch, however, Pitch Bend can be created
using the Exclusive Message specified for the
as
Format (see
the PR-300S MIDI Implementation for further details).
Program Change Messages
These messages are used to select sounds for the 16 Parts of
the
as
Sound Source. When a Program Change message is
received by the GS Sound Source, the corresponding sound is
assigned to the appropriate Part.
Variation Select Messages (Control Change 0)
Variation Select Messages (sometimes called "Bank Select")
are used to assign variations of a capitol tone to one of the 16
Parts in the GS Sound Source. Variation Select messages must
be used with Program Change messages. To select a sound
which has a different variation number than the sound currently
assigned to a Part, send a Variation Select message first, then a
Program Change message. This combination of Variation Select
and Program Change messages allows the selection of 16,384
different sounds.
Modulation (Control Change 1)
Normally, when this message is received, the pitch of the
sound being played is modulated (cyclical pitch variation is
added to the sound). This effect is usually controlled from the
modulation wheel on a keyboard.
You can change the type and application of the effect
controlled by these messages by using the Exclusive Message
specified for the GS Format (see the PR-300S MIDI
Implementation for further details).
Volume (Control Change 7)
Normally, this message causes a change in the volume of the
Part controlled. These messages can be used in conjunction with
Expression messages (below).
Panpot (Control Change 10)
These messages are used to move the perceived "position"
of a sound in the stereo field.
Expression (Control Change 11)
Normally, this message causes a change in the volume of the
Part controlled. These messages can be used in conjunction with
Expression messages (above).
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