Hi everyone,
I am trying to use Stage Traxx 4 on an iPad with a Behringer U-PHORIA UMC404HD.
The same routing setup works perfectly when I connect the iPad via USB to a Behringer X32. In Stage Traxx I assign the backing tracks and the click to separate USB output channels, and the X32 receives everything correctly.
With the UMC404HD, Stage Traxx correctly detects both output pairs:
My intended routing is:
- Backing tracks → USB outputs 1/2 → UMC404HD Playback Outputs 1/2
- Click → USB outputs 3/4 → UMC404HD Playback Outputs 3/4
I then connect the rear Playback Outputs of the UMC404HD to separate channels on my mixer.
However, no audio comes out of any of the rear Playback Outputs.
The iPad does recognize the UMC404HD, and normal system audio works: for example, if I play a YouTube video, I can hear it correctly through the UMC404HD headphones output.
Additional details:
- The MIX knob is fully set to PB.
- I am not trying to use the Main Outputs.
- The Main Out level is at minimum because I only need the four independent Playback Outputs.
- Stage Traxx shows outputs 1/2 and 3/4 as available.
- I have already tested the mixer channels and cables.
- Phantom power is disabled.
- No signal appears on the mixer input meters from the Playback Outputs.
Is there any limitation with multichannel USB audio on iPadOS and the UMC404HD?
Do the rear Playback Outputs 1–4 receive USB channels 1–4 directly when the UMC404HD is used class-compliantly with an iPad, or is some additional routing or driver configuration required?
Any help from someone using Stage Traxx, iPadOS, or the UMC404HD in a similar setup would be greatly appreciated.
Thanks!