MultiStompController - a compact MIDI converter that receives MIDI data from the MOEN GEC5 loop switcher (or other MIDI sources) and translates it into separate MIDI outputs for the Zoom MS-50G Multistomp (via MIDI-USB) and the Strymon Iridium or any other MIDI device (via MIDI-EXP).

Resources used:

• Arduino Nano v4 compatible https://www.hobbytronics.co.uk/arduino-compatable-nano-v4

• USBHost v2.4 (preloaded with MIDI Device firmware) https://www.hobbytronics.co.uk/usb-host-board-v24

• MIDI breakout board https://www.hobbytronics.co.uk/audio-midi/midi-breakout

• DPDT momentary switches for "Tuner" and "Update Patch" functions

• 24LC256 (32kb EEPROM) - optional, for flash memory storage of patches

Arduino libraries used:

• AltSoftSerial (https://www.pjrc.com/teensy/td_libs_AltSoftSerial.html)

• SoftwareSerial

• EEPROMext (optional, for flash memory storage of patches)

Wiring instructions:

• Connect [VIN, GND] of Arduino to 9V DC (careful, center negative).

• Connect [5V, GND] on USBHost and MIDI breakout board to [5V, GND] on Arduino.

• Connect RX on USBHost to D02 (Pin 5) on Arduino (SoftwareSerial TX).

• Connect TX on USBHost to D03 (Pin 6) on Arduino (SoftwareSerial RX).

• Connect MIDI In on MIDI breakout board to D09 (Pin 12) on Arduino (AltSoftSerial RX).

• Connect MIDI Out on MIDI breakout board to D08 (Pin 11) on Arduino (AltSoftSerial TX).

• Connect DPDT "Tuner" switch to [A0, GND] on Arduino.

• Connect DPDT "Update Patch" switch to [A1, GND] on Arduino.

Optional, for flash memory storage of patches:

• Connect [5V, GND] on 24LC256 to [5V, GND] on Arduino.

• Connect [SDA, SCL] on 24LC256 to [SDA, SCL] on Arduino (see https://www.lehelmatyus.com/691/sda-scl-arduino-nano-connecting-i2c-devices-arduino-nano and further https://www.hobbytronics.co.uk/tutorials-code/arduino-tutorials/arduino-external-eeprom).

Connection instructions:

• Connect MIDI In to the MOEN GEC5 loop switcher (or other).

• Connect MIDI Out to the Strymon Iridium (or other).

• Connect USBHost to the Zoom Multistomp.

Customization / adaptation notes for other setups:

• MultistompController.ino contains the main program flow.

• MIDI In is collected via a static MidiBuffer, which feeds input to the Controllers.

• The main controller classes MidiController and ZoomController derive from the Controller class and define the output/through logic of the corresponding devices (i.e. how inputs are converted to outputs or passed through).

• These controllers must implement the events OnReceiveCC, OnReceivePC and OnResetCtrl. They may also override the default methods Update, OnSend and Reset.

Prototype images:

Function table:

Thanks to g200kg whose work on https://github.com/g200kg/zoom-ms-utility inspired this project.