I want to record 10 channels from Mackie DL16S on an iPad pro. DAW recognises the input channels when the Mackie DL16S is connected by usb-c, but it is not possible to arm more than a few (previously armed channels are disarmed when new channels are armed). Suggestions?

You may have to map the tracks before arming, use the IN button next to the arm button on each track to select the channel, then they can be armed.

Thank you, but the tracks have been mapped.

The tracks are all mapped to different input channels?

Yes, mapping of channels works fine. The 16 channels available are listed and I have selected different channels for the various instruments and vocals.

So the first track is armed but as soon as you arm the second track, the first track disarms? And if you arm the third track the 2nd disarms? The tracks are all properly mapped and this is happening when the IN meter (bottom left) is displaying a meter with 16 channels? Please describe exactly what you're doing and what happens, this is definitely out of the ordinary

I made it work. I suspect the reason for my trouble was an unstable connection with the mixer. Sorry for the fuzz!

Awesome! Nice.