User Manual
PYTHAGOREAN
Based on eleven pure Pythagorean fifths and a wolf
fifth on G#. This tuning can be used to play
monodies, and music that does not use thirds in
general.
Most useful for curiosity and educational ends.
7.5 WHAT MIDI IS
The MIDI interface (Musical Instrument Digital Interface) allows instruments of different makes
and kinds to communicate with each other, using this very specific protocol of codes. This allows
the creation of systems of MIDI instruments, offering much greater versatility and control than is
possible with single instruments. To make this communication possible, all MIDI instruments have
two or three 5-pin DIN connectors called:
MIDI IN: The connector through which the instrument receives the MIDI data transmitted by
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other units.
MIDI OUT: The connector through which the instrument sends the MIDI data it has
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generated to other units.
MIDI THRU: This connector, not always provided on all instruments, is used for connecting
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several units in series, since it transmits the MIDI data exactly as they are received by the
respective MIDI IN port.
Most instruments equipped with MIDI interface transmit MIDI messages which specify, for
example, which note has been played and with what dynamic, by means of the MIDI OUT
connector. If this connector is connected to the MIDI IN connector of another MIDI instrument,
such as an expander, the second instrument will respond exactly to the notes played on the
transmitter instrument.
The same type of information transfer is used for recording MIDI sequences. A computer or a
sequencer can be used to record the MIDI data generated by the transmitter instrument. If these
recorded data are sent back to the instrument, it automatically repeats the recorded performance.
MIDI is able to transmit a multitude of digital data by means of just one cable, and thus just one
connector. this is thanks to the MIDI channels. There are 16 MIDI channels, and in a similar way as
for radio communications in which two stations can only communicate if they are tuned to the
same frequency (or channel), two MIDI instruments connected together are only able to
communicate if the transmitter instrument channel is the same as the receiver instrument channel.
MIDI messages subdivide into channel messages and system messages. The following is a short
description of these messages:
Chorum 10 Dlx – Chorum S10 – Chorum 10
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