MIDI Channel Duplicator

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Description:

The MIDI Channel Duplicator can be used to select any single MIDI channel (1 to 16) via a 4-way DIP switch and increase the MIDI output by copying/transmitting that channels commands to all the other MIDI channels (except channel 10 which is normally the drum channel) to the MIDI output. This allows multiple sound sources to be played on a multitimbral synthesiser simultaneously. Note that this unit operates via the MIDI IN and OUT sockets only and not through the USB connection.

Operation: This unit provides the ability to copy the MIDI Notes On and Off commands, Control Change, Program Change, Pitch Bend, Polyphonic Key Pressure and Channel pressure commands.

So, for example, if the input channel was selected to Channel 7 via the 4-way DIP switch then whatever data arrives in on Channel 7 will be copied/transmitted on the output to all MIDI channels 1 to 16. (Except MIDI Channel 10 which is the default MIDI drum channel). Also the other input channels ( 1 to 6 and 8 to 16) will be blocked and not pass through to the MIDI output.

Power Supply:

External power can come either from an AC-to-DC adapter or battery. The adapter can be connected by plugging a 2.1mm center-positive plug  into the board's power jack.

The board can operate on an external supply of 7 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.

MIDI Channel Selection:

The MIDI Channel Duplicator commands are all channel (1-16) dependent. The system will also work with MIDI running status.

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Features:

The MIDI Channel Duplicator Unit consists of:

• An assembled, built and tested Arduino board including a suitable pre-programmed microcontroller,
• The MIDI channel (1-16) is user selectable via the 4-way DIP switch
• A 2.1mm power socket, and associated LED,
• A MIDI activity LED,
• An assembled, built and tested MIDI In/Out Board,
• A 150mm wired MIDI 5-pin DIN input socket,
• A 150mm wired MIDI 5-pin DIN output socket,

The MIDI Channel Duplicator Unit requires:

• a 9v battery or equivalent DC power source

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Resources:

The MIDI Channel Duplicator Unit Resources:

• The MIDI IN/OUT circuit schematic is available,
• The MIDI IN/OUT wiring is also available.
• The Arduino Uno Board Schematic is available,
• The Arduino Uno Board Pin Layout is also available,
• MIDI Source Code for the Arduino.

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