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If you have multiple audio interfaces and you are using AUM...

This is not another "can I have multiple audio IO interfaces working at the same time" post. We know that doesn't currently work on the iPad. But, I just ran into an interesting "quirk" if you have multiple devices that can act as interfaces.

I have my Digitone, Digitakt, and Focusrite 18i8 all hooked up to a USB hub feeding into AUM. The end routing goal is to have the DN be the audio interface for the iPad when I'm traveling, so that's how I've been rehearsing and writing my set. Every time I'd turn on the Focusrite card, though, if I wanted to use the MIDI DIN inputs from my other gear, AUM would default to that as the audio IO, too, and I had no way to re-select the DN.

BUT - I seem to have discovered how AUM chooses it's audio IO.

If I hook up the iPad and turn on the Digitone first, the iPad will choose that as my audio output. If I turn on the Focusrite after AUM has chosen the DN, AUM automatically switches to the Focusrite. If I then turn the DN off and back on again, AUM switches back to the DN. So it seems that AUM chooses it's audio interface based on whichever one was turned on most recently. Luckily, no matter which device is being used for audio, MIDI still works for all of them at the same time.

Comments

  • wimwim
    edited July 2021

    All correct, except that it's iOS, not AUM, that is choosing the last interface to activate (either through plugging in or turning on). Even earbuds with a microphone will do this.

    I can't count the times I've forgotten this and spent time trying to figure out why my iRig Pro was barely registering any signal, only to finally remember that I plugged in my earbuds and my guitar was coming through the headset mic rather than the iRig. 😂

  • Yes, but that is not AUM behavior. It is the iPad itself that connects to the most recent audio interface connected, and AUM uses what the iOS system has identified as the interface.

  • @wim and @suspish A-ha! Yet another fun Apple quirk! :)

  • Which is another reason why Logic for iPad is nowhere in sight. The Logic team wouldn’t put up with such shenanigans

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