On the power line cord the neutral usually has a wider blade. Also the cord MAY have ribs on the side of the neutral conductor. The polarity of this cord is NOT important to the operation... the power supply does NOT care.
If you are asking about the cord that goes from the power supply to the mixer, then we need to talk further. This three wire connector has a ground and two 19 VAC hots. Describing the pins in the triangular pattern would be risky... HOWEVER you can use an ohmeter to find the single ground by looking for near zero ohms on one and only pins of the mixer to a ground on one of the 1/4 inch jacks. The dual 19 VAC power supply is rated at 1.5 Amps (1500ma) for each of the 19 VAC outs.
Note these 19 Volt hots come from either side of a 38 volt centertapped transformer with the centertap to the ground.
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