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The story of this project starts with a hack of the MIDIPLUS/MIDITECH 4x4 USB to MIDI interface. Needing more midi jacks, I bought a second Miditech interface, but I discovered it was not possible to use 2 Miditech / Midiplus MIDI USB 4X4 on the same computer to get 8x8. This is mainly because of identical product/vendor ID and serial, and , according to the Miditech support, as that usb midi interface is not updateable at all, I was stucked....That was motivating me enough to go deep in the detail, and try, at less to change the PID or VID.

The MCU of the Miditech / Midiplus 4x4 midi interface is a high density STM32F103RC, a common uC ARM STM32F1 chip family used on most musical gears like the Arturia Minilab, the Novation Launchkey and Launchpad for example. It is a very powerful chip, especially when you compare it to the Arduino Uno (ATMEGA328P).

As a former AVR platform developper, I choose to use STM32DUINO to preserve a part of my knowledge and to reuse my existing software libraries. STMDUINO is a port of the famous Arduino platform for the Maple Mini and other STM32 F1 and F4 boards, continuing by Roger Clark where Leaflabs left off.

To hack the Miditech interface, I had to remove some resistors on the motherboard because they were disabling the low level bootloader thought the UART1. After an upload of a STM32DUINO generic bootloader, I was able to compile and load from the USB a "blink" hello world sketch with the Arduino standard IDE.

Read about the detailed hack here Contribution guidelines for this project