Samick SDP31 Owner's Manual - page 23
21
USB_LOCL OFF
The instrument will not send the songs of the USB disk to the internal tone
generator but will send all the midi information from the Midi Out of the
instrument.
Press the MIDI button again to select the PROGRAM CHANGE On/Off
PGM ON
This configuration will allow the instrument to send and receive the Program
Change Midi information.
PGM OFF
This configuration will NOT allow the instrument to send and receive the
Program Change Midi information.
Press the MIDI button again to select the PROGRAM CHANGE On/Off
CTL ON
This configuration will allow the instrument to send and receive the Control
Change Midi information.
CTL OFF
This configuration will NOT allow the instrument to send and receive the
Control Change Midi information.