How to without aux in?

Hi! Device not arrived to me yet, but I have a questions:-)
NC does not have aux in. How can I output metronome or backing track to headphones? I would like output audio to headphones connected to the device. It is advisable to output audio from a mobile phone and not have other additional bulky devices (mixer, laptop, etc.), but I read in the FAQ that Bluetooth not for this. Is it possible through the USB? Will the NC work with phone(Android) via USB like a sound card? Or via capture in (mono is fine)? Do you have a plan for built-in metronome?

The NC is an audio interface that is USB core audio compliant. You are correct that Bluetooth is not utilized nor supports audio and is only utilized for control etc.

I use a small two channel mixer I got off aliexpress. Two inputs and an aux in. Cost me 40$ CAD.

I’ve been thinking about that too. I have an AMT Pangaea U2, it’s small with a minimal IR latency, other effects, aux input, and headphone output. But the “mixer” needs to be powered with something. I’d like to put all this stuff in a small bag and go on a trip. Minimum of wires, minimum of power supplies… Let’s see if NC can work as a mobile phone sound card…