A3
Effect 1, 2 and 3 selection screen don't shown in the display.
By pressing the LED switch to toggle effect on/off, you'll see effect selection screen for EFFECT 1, 2 and 3. To select each effect for those, press the switch underneath EFFECT 1, 2 or 3 shown in the display.
Can I change patches?
Yes. By setting up the order of patches, you can change the patches by pressing foot switch with the order you set up.
Can I use the A3 as audio interface?
No. The A3 doesn't have the function of audio interface.
Can I apply effects to the signals from the microphone input?
Yes. By setting up the mix position of the microphone input, you can apply effects to signals from the microphone.
Can I use phantom power for a condenser microphone?
Yes you can. Please refer to 23 page of the Operation Manual "To change mix input settings".