Hello Peter,
I honestly don't think that this could happen but I'd like to know your thoughts on this (I'm quite new to apple) :
On my Ipad, I plug a USB cable going to my XR18 and a USB cable to my Helix pedalboard. In "ST3 / Audio Routing / Multitracks Output / " I can see the channels of the XR18 or the Helix depending on which usb is plugged last (never all channels at the same time). When using Audiobus, I get a similar behaviour, I can only see the last one plugged in)
Ideally what I would like is to pass through 1 usb cable to my XR18 : ST3 multitracks + Helix (2 channels: guitar and mic).
The goal is to reduce the number of cable between my pedalboard/Ipad and my Mixer. The second goal is to maximise audio quality, since I could keep a digital signal out of my helix (instead of converting it to analog)
Is it doable to pass through ST3 some Helix channels in addition to the multitracks channels ?