10 pickups are located on the treble side of the piano accordion and
3 pickups are located on the bass side
NO BATTERY IS INVOLVED IN THIS SYSTEM,
- it have own power supply.
With this controller MC3 
you can adjust the following:
-Treble microphones
- Bass microphones
- Vocal microphone (on the model with display) as an extra option
- Effects ON/OFF (extra option)
- Increase of treble micro for solo
- EQ1, save preset 1 -one complete micro setting
- EQ2, save preset 2 -one complete micro setting
- Turn On/OFF all microphones
- Volume control
- Reverb for treble and vocal micro
- Equalizer for treble tone range
- Equalizer for medium tone range
- Equalizer for bass tone range
Also with purchasing gooseneck 
or head set vocal microphone
you can sing or make an announcements
directly from the accordion.
If you want to record your own music and make your own CD - simply plug it
in
directly to the PC or recording device - do not need any extra cables.
Power supply ,cables and manual are included with the system.
