Yamaha MONTAGE M6 Operation Manual page 85

Connecting microphones and audio devices
1
Make sure to turn off the instrument and set the A/D INPUT [GAIN] knob to
the minimum value.
2
Connect the external device to the A/D INPUT jack(s) on the rear panel.
Connecting a microphone
NOTE
Make sure to use a dynamic microphone. Condenser microphones cannot be used.
Connecting audio equipment or an electronic instrument
(1) Stereo audio equipment (CD player, etc.)
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