My assumption was/is that you can have multiple Rotary Encoders but you can't wire them together into a Matrix ( like normal buttons) as well to try and save Pins ie each Encoder needs it's own 3 pins , perhaps having the Rows as one common Row may work ??? (similar to Pots) But I have not tested that as my two new Encoders just arrived yesterday and I was busy Hacking / Repairing my Multimeter today since my Pro Micro's are still some in a Customs Warehouse I assume
With luck Erichos or one of the other Gurus here will pop in and confirm things for you.
