Why don't you want to use the Object Monitor !
May be there is a change in the AudioMidi
Cyril, I'm glad to meet another retired professional engaged in the joy and challenges of digital music-making! I was formerly a weapon systems designer.
I started getting seriously busy with digital sampling techniques for orchestral music production in 2001, using a 400 MHz iMac with Logic Audio Platinum v3.5, Reason v1, and Peter Siedlaczek's Advanced Orchestra samples. I immediately recognized Logic's Environment to be a wonderful facility in which to develop a concept I'd worked on theoretically back in the '70s - i.e., replacing Equal Temperament with authentic orchestral intonation. Way back then I had designed a mutliple-derivative divider to produce the set of tones I needed (using very high speed Motorola 2900 ECL chips), with the intention of synthesizing orchestral instrument sounds. Well I soon realised it was extremely difficult to synthesize authentic-sounding orchestral instruments, and was glad to see that the digital-sampling technique was far superior for orchestral music production. But then I became very busy with the stimulating challenges of high-end military work, and my ideas for music production lay dormant for years.
So anyway, Logic's Environment has been my main place of work ever since I first met it 21 years ago.
Perhaps I didn't clearly explain my own current situation with Logic. I have no problems working in High Sierra with VEPro AU3 7.0.1056 and Logic 10.4.8, using my AU3 multiport template. I shall continue with this configuration for as long as possible, hoping that Apple will eventually fix the new problems in Logic 10.7. But I also have a Big Sur boot volume in which I keep an eye on the state of affairs with later Logic and VEPro versions (though of course I won't know about Apple M1 operation until I buy M1 hardware).
I'm sure other Logic users who don't have the convenience of working with an older Logic in an older macOS may want to know about your VEPro AU2 multiport workaround, Cyril. Perhaps you will post something about it here? (Toutefois, Je suis certainement d'accord pour dire que la perspective d'une arriviste déclenché, jetant sa merde tout atour en conséquence, est désagréable pour vous et moi. Lol.)