Thank you for the additional information. I had never bothered to download the pdf manual but have now done so and the latest version of it (p. 182) shows it as apparently downloadable from the MM web page. But it isn't (downloadable there) as I'm sure you've discovered!
However, I've just checked on Google Play Store and there is an Android app, Magix Audio Remote available there. No idea how well it works - reviews are a bit mixed. I presume there is a parallel app available for Mac?
Would be interested to hear how well it works. I tested it on my system but, because my computer is connected by Ethernet rather than Wi-fi, it would appear that it cannot work for me 😭
I downloaded it on my iPhone SE and it's just called "Audio Remote." But it works just fine for me. I'm also on Wi-Fi. I was using it more for the novelty of it, not really anything else. I don't know how convenient it is to have.