Roland GO:MIXER PRO-X Owner's Manual page 4

(*1) Connect only the included cable to this unit's USB port.
Also, do not connect the included cable to any device
other than this unit (p. 6).
(*2) You must connect your guitar, bass, or mic to this jack.
If a mic and/or guitar are not connected, turn the
[GUITAR/BASS] knob, [MIC] knob, or [HEADSET MIC]
knob all the way to the left (the minimum setting). If the
knob is not at the minimum setting, noise might enter
the signal.
(*3) Pin assignment of MIC connector (XLR, TRS).
1: GND
2: HOT
3: COLD
(*4) If you're using a condenser mic that requires an external
power supply, set the [PHANTOM POWER] switch to
"48 V. "
(*5) If you need to supply phantom power when using an
iPhone or iPad, install batteries in this unit. (If batteries
are not installed, phantom power cannot be supplied
even if the [PHANTOM POWER] switch is set to "48 V. " In
this case, the POWER indicator blinks.)
If you're using an Android smartphone, phantom power
can be supplied both when you're using batteries and
when power is supplied from the smartphone.
Phantom power supply
conditions
Using batteries
Supplying power from
the smartphone (USB)
Sleeve: GND
Tip: HOT
Ring: COLD
Android
iPhone,
iPad
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