An external effects unit I've connected to the MULTI I/O section won't work. What should I do?

Check the following, depending on the [SOURCE] set with the selector button in the MULTI I/O section.

■ When [1/4"JACK] is selected
1. Make sure the [ON/OFF] button in the MULTI I/O section is blinking.
2. Check the [CH SELECT] switch to see if the channel you want to apply the effect to is selected.

■ When [USB] is selected
1. Make sure the [ON/OFF] button in the MULTI I/O section is blinking.
2. Check the [CH SELECT] switch to see if the channel you want to apply the effect to is selected.
3. Check if the [LEVEL] knob is in the proper position.
4. For the channel with its channel select switch set to [MULTI I/O] (CH2 or CH5), turn the [TRIM] knob and slide the channel fader away from you.

Note:
iPhones and iPads with a Lightning port won't work; you'll need to use an iPhone or iPad with a USB Type-C port instead.