How to connect a MacBook to QU-PAC via USB-B?

Hello.
I want to play MP3 files from my MacBook PRO (A1502) via the USB-B port

My settings:

    1. I connected the laptop with cable USB—>USB-B
    2. In the MacBook settings “Sound - Output” I selected QU-Pac, that is the MacBook recognized the connection to the QU-Pac
    3. Set the ST1 channel to receive the signal from the USB-B

I turned on the MP3 track on the MacBook but the QU-Pac sound does not play. On the IPad screen (QU-Pad) the signal indicator on ST1 is intact

Why is it not playing?

It might be a good idea for you to step your way through this doc.

https://support.allen-heath.com/hc/en-gb/articles/4403019846033-Qu-How-do-I-route-audio-to-and-from-my-Qu-mixer-and-a-DAW

You will also need to ensure your Mac book pro is us sending sound output to your QuPac, do this with the “Audio MIDI setup” utility.

Good luck

S