1.5V DC power port

2.2,3,4, and 5 are single-channel audio outlets. After volume

adjustment, channel i to channel 4 audio outlets are used

3.6 is the main audio input port

4.7 is stereo channel and mono channel selection. Press the

button to select stereo channel and press the button to select

mono channel

5.8,9,10, 11 are 1 to 4 audio output adjusting volume

potentiometers

6. 1 2 is the power indicator.