Lin GND Rin: respectively indicates the left channel in the audio input signal, the ground line, the right channel

Lout GND Rout: respectively indicates the left channel in the audio output signal, the ground line, the right channel

MICI MIC2: used to connect the microphone, the connector of the microphone can be directly plugged in.

Music volume knob: used to adjust the sound quality of background music (accompaniment)

Microphone volume knob: used to adjust the size of the microphone sound

Reverb depth knob: used to adjust the size of the microphone sound

Reverberation time knob: used to adjust the playback time of the microphone sound