7918KB - Yamaha
7918KB - Yamaha
7918KB - Yamaha
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MIDI Functions<br />
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In the rear panel of your PSR-730/630, there are MIDI terminals (MIDI IN, MIDI OUT), a TO<br />
HOST terminal, and a HOST SELECT switch. By using the MIDI functions you can expand<br />
your musical possibilities. This section explains what MIDI is, and what it can do, as well as<br />
how you can use MIDI on your PSR-730/630.<br />
What’s MIDI?<br />
No doubt you have heard the terms “acoustic instrument” and “digital instrument.”<br />
In the world today, these are the two main categories of instruments. Let’s consider an<br />
acoustic piano and a classical guitar as representative acoustic instruments. They are<br />
easy to understand. With the piano, you strike a key, and a hammer inside hits some<br />
strings and plays a note. With the guitar, you directly pluck a string and the note<br />
sounds. But how does a digital instrument go about playing a note?<br />
● Acoustic guitar note production<br />
Pluck a string and the body resonates the<br />
sound.<br />
● Digital instrument note production<br />
Based on playing information from the keyboard, a<br />
sampling note stored in the tone generator is played<br />
through the speakers.<br />
As shown in the illustration above, in an electronic instrument the sampling note<br />
(previously recorded note) stored in the tone generator section (electronic circuit) is<br />
played based on information received from the keyboard. So then what is the<br />
information from the keyboard that becomes the basis for note production?<br />
For example, let’s say you play a “C” quarter note using the grand piano sound on<br />
the PSR-730/630 keyboard. Unlike an acoustic instrument that puts out a resonated<br />
note, the electronic instrument puts out information from the keyboard such as “with<br />
what voice,” “with which key,” “about how strong,” “when was it pressed,” and “when<br />
was it released.” Then each piece of information is changed into a number value and<br />
sent to the tone generator. Using these numbers as a basis, the tone generator plays the<br />
stored sampling note.<br />
Example of Keyboard Information<br />
Voice number (with what voice) 01 (grand piano)<br />
Note number (with which key) 60 (C3)<br />
Note on (when was it pressed) and<br />
note off (when was it released)<br />
Timing expressed numerically (quarter note)<br />
Velocity (about how strong) 120 (strong)<br />
L<br />
Sampling<br />
Note<br />
Tone Generator<br />
(Electronic circuit)<br />
Playing the keyboard<br />
Sampling<br />
Note<br />
R<br />
119