How to control a DSP-G1 programmatically/electronically? I want to generate music/sounds for a video game I am making with my son (using an Arduino Mega and a 240x320 LCD graphical display). I have a basic understanding of the MIDI protocol. I've been a computer programmer for over 30 years. I read the MIDI implementation in the DSP-G1 manual, but I don't understand how to go from this to sending the right signals from the dev board to the chip pins.

Everything I find is about connecting a physical MIDI device. Can anyone possibly provide or point me to information on how to control the DSP-G1 programmatically/electronically? I think I need some hardware or software to serialize MIDI protocol bytes into a sequence of voltage changes, but all my searching leads me to info about a physical device.
The purpose of the MIDI output circuit is to convert the TTL signal into a 5 mA current.
The purpose of the MIDI input circuit is to convert the current back into a TTL signal.

If the Arduino and the DSP-G1 are part of the same circuit (and share the ground), you can omit these conversions, and connect the Arduino's TX directly to the LPC810's RX, without any other components needed. (The LPC810 requires a 3.3 V power supply, but its RX pin is 5 V tolerant.)

MIDI was designed to work with most microcontrollers, so it uses standard UART signals at 31250 baud. The only configuration you need is:

Serial.begin(31250);