However, you will find users around here that help out with queries on a more regular basis.
Regarding Audiokit, is the synth AUv3? MG3 only scans AUv3 synths. If the synth only supports Inter-App Audio (deprecated by Apple some years ago) you’ll need to run it in parallel and send virtual MIDI to it. AFAIK, only the “King of…” plugins from Audiokit are AUv3. But search and/or ask here and on the Loopy Pro forum and you’ll surely find the answer you’re looking for.