Yamaha Personal Electronic Piano YPP-15 - Manual (Page 11)

1) Program Change Message
Program Change message is used to change voices
on a Slave instrument. For instance, with the YPP-
15 set up as a Master, if you select one of its voices,
a Program Change message (including MIDI Pro­
gram Number) will be transmitted to the Slave. If the
Slave has the MIDI capabilities to receive this
message, its own voice will be changed according to
the MIDI Program Number it has received. Con­
versely, when the YPP-15 is the Slave, it can receive
the message and will automatically select its voice
according to the MIDI Program Number from the
Master.
The following chart shows the relation between
YPP-15 voices and MIDI Program Numbers.
YPP-15 Control Change Message
Reception Capabilities
MIDI Program
Number
OOH
01H
02H
03H
04H
YPP-15 Voice/Volce
Select Button
PIANO 1
PIANO 2
E. PIANO
HARPSICHORD
VIBES
* This relation appiies to both transmission and reception.
MIDI program numbers other than those in the chart
cannot be transmitted or received.
Cancelling Program Change Message
Program Change message is automatically avail­
able when the YPP-15 is turned on. Though it is a
very useful feature, you may sometimes run into a
situation where you wish to cancel it. To cancel
Program Change message, while holding down the
MIDI/TRANSPOSE button, press the Voice Select
button PIANO 2. To reactivate this message, repeat
the same procedure.
2) Control Change Message
Control Change message deals with various as­
pects of the played sound. For instance, when
you’re using the YPP-15 as a Master and depress
the foot switch, a Control Change message (includ­
ing MIDI Control Number and a Damper value) will
be transmitted to the Slave, so that the the Slave’s
sound will also be sustained (unless it cannot receive
the message). If the V P P - ^ 5 is the Slave, it will
receive Control Change message instructions from
the Master.
MIDI Control
Number
Name Value
64 Damper 0-63:Off, 64-127:On
122 Local On/Off (*1) 0: Off, 1-127: On
123 All Notes Off (*2) 0
124 Omni Off (*3) 0
125 Omni On (*3) 0
(*1) Local On/Off: Upon reception of a Local Off
message, the YPP-15’s keyboard will be separated
from its internal sound module. See “Example 3” on
page 11 for details.
(*2) All Notes Off: As soon as the YPP-15 receives
this instruction, all of its notes sounding at that time
will be muted.
(*3) Omni Off/On: See the following section, “MIDI
Channels”, for details.
Cancelling Control Change Message
Normally, Control Change message is automati­
cally available when the YPP-15 is turned on. But
you may wish to create a situation where, for example,
the Slave YPP-15 sounds are not sustained in
tandem with the Master sounds. To cancel the
Control Change message, while holding down the
MIDI/TRANSPOSE button, press the Voice Select
button E. PIANO. To reactivate this message,
repeat the same procedure.
The above-described Note On, Program Change,
and Control Change messages are known as MIDI
channel information. That is, these messages are
communicated through MIDI channels. Sowhatare
MIDI channels? The next section addresses this
question.
The YPP-15, as a Master, can transmit only Damper
information (MIDI Control Number 64 in the follow­
ing chart) As a Slave, however, it can receive a lot
more information, as shown in the chart above: