I haven’t worked with iPlug2 but the code you have asked about here looks like iPlug1.
1-1 1-2 2-2 should work - but I did have a lot of trouble getting iPlug1 sidechaining to work in Logic (similar I/O issues). Please see my posts on this forum about sidechains in Audio Units. I understand you are not asking about sidechains but maybe you will find a nugget in there that might help you with 1-2.
BTW - I don’t know this for a fact but it appears that Logic’s plugin validation process actually passes a signal into the plugin and checks for support of all stated configurations. If your input/output read pointers are not set up right it will fail validation. Again, check the posts here about AU channel routing.
Last edited by Nonlinear; 11-01-2020 at 09:29 PM.
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