Yamaha PSR-450 Owner's Manual - Page 63

MIDI Functions MIDI is an acronym that stands for Musical Instrument Digital Interface, which allows electronic musical instruments to communicate with each other, by sending and receiving compatible Note, Control Change, Program Change and various other types of MIDI data, or messages. The PSR-450 can control a MIDI device by transmitting note related data and various types of controller data. The PSR-450 can be controlled by the incoming MIDI messages which automatically determine tone generator mode, select MIDI channels, voices and effects, change parameter values and of course play the voices specified for the various parts. MIDI messages can be divided into two groups: Channel messages and System messages. Below is an explanation of the various types of MIDI messages which the PSR-450 can receive/ transmit. ● Channel Messages The PSR-450 is an electronic instrument that can handle 16 channels. This is usually expressed as "it can play 16 instruments at the same time." Channel messages transmit information such as Note ON/OFF, Program Change, for each of the 16 channels. Message Name Note ON/OFF Program Change Control Change PSR-450 Operation/Panel Setting Messages which are generated when the keyboard is played. Each message includes a specific note number which corresponds to the key which is pressed, plus a velocity value based on how hard the key is stuck. Voice number (along with corresponding bank select MSB/LSB settings, if necessary). Messages that are used to change some aspect of the sound (volume, pan, etc.). ● System Messages This is data that is used in common by the entire MIDI system. System messages include messages like Exclusive Messages that transmit data unique to each instrument manufacturer and Realtime Messages that control the MIDI device. Message Name Exclusive Message Realtime Messages PSR-450 Operation/Panel Setting Reverb/DSP type settings, etc. Start/stop operation The messages transmitted/received by the PSR-450 are shown in the MIDI Implementation Chart on page 80. Things You Can Do With MIDI ● Connect to other MIDI devices via a MIDI cable and send and receive performance data. ● Connect to a computer via a MIDI cable and send and receive performance data. ● Local on/off: Determine whether or not notes played on the PSR-450 are sounded by the PSR-450's inter- nal tone generator. ● Initial send: When recording a PSR-450 performance to an external sequencer or similar equipment, this function sends the current PSR-450 panel settings so that when the sequence is played back the original panel settings are automatically restored. ● Clock settings: Allow other MIDI equipment to be synchronized with the PSR-450 for playback. PSR-450 Owner's Manual 63