CONTROL PANEL
1. Power on/off.
2. System display screen A
3. System A SD card slot.
4. System A USB input slot
5. System line input slot A.
6. Microphone input slot 2.
7. Middle Speaker - Range Volume
8. Mid speaker range frequency
9. BASS increase/decrease.
10. Treble Increase / Decrease.
11. System volume control A.
12. System A BT input key (Name GR-717A).
13. USB/SD card system input key (A).
14. TWS system (A).
15. System A line input key.