Add fadres to a lighthackbox_2_v4.

I have built a box with 4 encoders and 5 buttons, for which I had all the plans and code by Brad Evens Clark, but I wanted to add 3 faders and use the code from Sefan Staub.
I understand very little, very little, of code and I was not able to establish a handshake.
Could someone help me?
I am using a Teensy 3.5

Thank you very much

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