Yamaha P-120 Owner's Manual - Page 37
F8: MIDI Functions, A Brief Introduction to MIDI, F8.1: MIDI Transmit Channel Selection, F8
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The Function Mode F8: MIDI Functions G A Brief Introduction to MIDI MIDI IN MIDI OUT Synthesizer or Tone Generator MIDI Cable MIDI, the Musical Instrument Digital Interface, is a world-standard communication interface that allows MIDIcompatible musical instruments and equipment to share musical information and control one another. This makes it possible to create "systems" of MIDI instruments and equipment that offer far greater versatility and control than is available with isolated instruments. For example, most MIDI keyboards (including the P-120/P-120S, of course) transmit note and veloc- ity (touch response) information via the MIDI OUT connector whenever a note is played on the keyboard. If the MIDI OUT connector is connected to the MIDI IN connector of a second keyboard (synthesizer, etc.) or a tone generator (essentially a syn- thesizer with no keyboard), the second keyboard or tone generator will respond precisely to notes played on the original trans- mitting keyboard. The result is that you can effectively play two instruments at once, providing thick multi-instrument sounds. This same type of musical information transfer is used for MIDI sequence recording. A sequence recorder can be used to "record" MIDI data received from a P-120/P-120S, for example. When the recorded data is played back, the P-120/P-120S auto- Data Being Recorded matically "plays" the recorded performance in precise detail. Sequence Recorder MIDI IN MIDI OUT MIDI OUT MIDI IN The examples given above really only scratch the surface. MIDI can do much, much more. The P-120/P-120S MIDI functions allow it to be used in fairly sophisticated Playback Data MIDI systems. After selecting "F8.Y", press the [+/YESL] button to engage the MIDI function sub-mode, then use the [TEMPO/FUNCTION# M, L] buttons to select the desired MIDI function, as listed below. NOTE • The side-panel HOST SELECT switch must be set to "MIDI" in order to use the MIDI connectors. When you use the TO HOST connector, set the HOST SELECT switch to the appropriate position for the type of computer you are using (see page 41). In this situation, all MIDI settings described below will have affect on the MIDI signal in and out of the TO HOST connector. • Always use a high-quality MIDI cable to connect MIDI OUT to MIDI IN terminals. Never use MIDI cables longer than about 15 meters, since cables longer than this can pick up noise which can cause data errors. F8.1: MIDI Transmit Channel Selection F8.2: MIDI Receive Channel Selection Sequence Recorder MIDI OUT MIDI IN MIDI THRU Tone Generator (Set to receive on MIDI channel 2) MIDI IN (Set to receive on MIDI channel 1) The MIDI system allows transmission and reception of MIDI data on 16 different channels. Multiple channels have been implemented to allow selective control of certain instruments or devices connected in series. For example, a single MIDI sequence recorder could be used to "play" two different instruments or tone generators. One of the instruments or tone generators could be set to receive only on channel 1, while the other is set to receive on channel 2. In this situation the first instrument or tone generator will respond only to channel-1 information transmitted by the sequence recorder, while the second instrument or tone generator will respond only to channel-2 information. This allows the sequence recorder to "play" two completely different parts on the receiving instruments or tone generators. 37 P-120/P-120S 3 5