Ableton Forum

I recently picked up an IK Multimedia AXE I/O One interface and I'm having an issue when using it with Ableton 11 (on a MacBook Pro M2 running MacOS X 13.4). This interface has 3 outputs; 2 balanced on the back that are going to my monitors and another output on the front which is an "amp out" meant to feed something like a guitar amp (for re-amp purposes for example).

The issue I'm running into is that I can't seem to be able to output audio on all 3 outputs at the same time. The interface is detected by Ableton and it shows 4 outputs being available; I enabled all outputs. When setting up my tracks, I'm only able to output the outputs 1/2, which are my monitors. I'm never able to get anything routed to output 3. If I configure Ableton to only have outputs 3/4 enabled then I'm able to hear audio out of output 3.

I feel like this should be possible and I'm just not configuring something correctly, I'm just not sure what. I played around with Logic Pro and I'm able to configure it as described so I don't think it's a hardware limitation.

I have the same issue with the AXE I/O One. Did you ever get the amp out working in Ableton?

It seems odd because IK Multimedia bundles the interface with Ableton Lite.

I eventually figured this out using aggregate devices in macOS Audio Midi Setup.

Basically, Live on macOS doesn't play nicely with audio interfaces with a non-even number of inputs and outputs, such as the AXE/IO One which has 1 input channel and 3 outputs. Live's audio config lists 4 outputs, but selecting output 3 (or 3&4) results in no sound.

Using an aggregate device I add the my MacBooks internal microphone and Blackhole virtual audio device which gives me 4 input channels, and 5 output channels. Then in Live's audio setup only enable the ones I want to use.