What's the difference between [MULTI I/O] and [EXT1][EXT2]? Which should I connect to?

Select [MULTI I/O] or [EXT1][EXT2] according to the FX unit you want to connect.

■ [MULTI I/O]
Use this when you want to apply external FX to the pre-fader audio.
This is recommended when using an external FX unit that changes the original sound, such as the RMX-1000 or an isolator or filter.
Note: You can only use FX applications on iOS devices by connecting to [MULTI I/O].

■ [EXT1][EXT2]
Use this if you want to hear FX tail when the fader is set at the bottom when you apply echoes with an external FX unit.
We recommend this when you use reverberant FX units such as delays or reverbs.

Select the best option according to the channel you want to use and the connections on your devices.