Hi Dale,
You are right, we have not tested our app on Intel devices and there is a chance that it might not work due to the audio engine library being compiled for arm processors.
Intel promises to be able to run arm compiled native code, but as you pointed out, so far it has been a bit of a hit and miss.
Maybe you can go into the store and log in with your account on one of the test devices and download iReal Pro.
Otherwise we'll have to wait for someone to purchase one and find out.
Please let us know what you find.

Massimo.