Yamaha MU100 Owner's Manual page 86

A/D Input
3 Select the corresponding Part.
Use the [PART -/+] buttons. Since you connected to the A/D
INPUT 1 jack above, select Part A1 in this step.
4 Select the appropriate bank of presets.
Do this in the normal way, using the [SELECT </>] buttons to
highlight the bank number parameter, then using the [VALUE -
/+] buttons to change the bank.
The selected bank determines the type of input and sets the appro-
priate gain level. Each bank/type is indicated by an icon in the LCD:
Bank 000
88
For input of a microphone (or other mic level instruments).
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