U178 Synth Unit M5Stack U178 Synth Unit is an audio module designed for MIDI sound systems. This unit is equipped with a built-in SAM2695 audio synthesizer chip and a high-performance NS4150B class D amplifier chip. The U178 Synth unit accepts standard MIDI signals through serial communication. This unit includes audio synthesis and processing capabilities, such as audio synthesis, mixing, and sound effects processing. The U178 Synth unit supports the configuration of multi-channel instrument source output, four-stage EQ, and reverberation. This unit supports Arduino and UIFlow programming environments. The U178 Synth unit comes with a 20cm grove cable. This unit is used in the electronic music stage, STEAM education, and music production studio.