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hello,
i made the firmware update to 1.04 on my 750 MK2, made an IOS update on my Iphone SE.
I buyed the full version of the app, after install i was asked if i want to allow the mic input, i choosed to don't allow. then, the first recordings were fine.
But after that, i changed the recording format from wav to aiff, and since then, the app crashed.
app removed and instaleed again, tried all options but NO RECORDING, sometimes it starts recording but no input signal and no waveform, Or it doesn't start (counter) and no signal input.
even if i allowd the mic input and other options, no recording.
what can i do?
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@Carmelo > Sorry to hear that -- are you using an official Apple cable to connect to the mixer?
yes, i tried the original cable and others with MFI Certification
just made a screenshot

I’ve got the exact same issue.
Have updated latest firmware to 2.07 on my DJM900Nexus2 and running IOS 13.3.1 on my iPhone.
When I plug in a lightning cable the app on my phone recognises the mixer but when I play any track no waveform is shown on the app. Even though I can press record no sound is actually being recorded.
Have played around with the various levels on the mixer and app but it makes no difference. No waveforms are appearing