Roland SK-50 Owner's Manual page 17

Hold (1) Messages (Control Change No. 64)
Conveys the action of a damper pedal (whether it is depressed or released), which allows notes
that are already sounding to be sustained.
<TX> An ON message is sent when the pedal (a damper pedal, such as the optional DP-2;
connected to the Pedal jack on the unit's rear) is depressed, and an OFF message is sent when it
is released.
<RX> When a Hold ON message is received, notes already sounding will be sustained.
Naturally decaying sounds (such as the piano) will fade gradually until the Hold OFF message is
received, whereas sounds such as the organ (which normally are sustained) will continue
sounding until the arrival of the Hold OFF message.
Sostenuto Messages (Control Change No. 66)
A sostenuto pedal is a pedal that allows only those notes that are pressed at the very moment
the pedal is depressed to be sustained (until the pedal is released again). This message conveys
the action of this kind of pedal (whether it is depressed or released).
<RX> When a Sostenuto ON is received, any notes for which a Note ON was received at the
same moment will be sustained. Naturally decaying sounds (such as the piano) will fade
gradually until the Sostenuto OFF is received, whereas sounds such as the organ (which
normally are sustained) will continue sounding until the arrival of the Sostenuto OFF message.
Soft Messages (Control Change No. 67)
A soft pedal is a pedal that causes notes already sounding to become softer. This message
conveys the action of this kind of pedal (whether it is depressed or released).
<RX> When a Soft ON is received, the cut-off frequency is lowered, and sounding notes are
made softer. The sound returns to normal when a Soft OFF is received.
Reverb Messages (Control Change No. 91)
These messages are used to apply reverberation to what is played by a Part.
<RX> Alter the depth of the reverb effect (
Chorus Messages (Control Change No. 93)
These messages are used to apply chorus to what is played by a Part.
<RX> Alter the depth of the chorus effect (
Portamento Time Messages (Control Change No. 5)
Portamento Messages (Control Change No. 65)
Portamento Control Messages (Control Change No. 84)
Portamento is an effect which produces a smooth transition in pitch between a previous note
and one just pressed.
<RX> Portamento is turned ON or OFF when a Portamento message is received. The speed of
the pitch transition is set when Portamento Time messages are received. When a Portamento
Control message is received, the Source Note Number (the previously pressed key) is specified.
16
SOLO Volume, p. 19).
SOLO Volume, p. 17).