DAC + Pro volume control with Crankshaft


I just purchased the DAC + Pro to use with my RPI3 and running Crankshaft to use in my car to replace the factory stereo.

I got the DAC hooked up,  and the audio is going to my amps.  The issue is the volume is at 100%.

I've been searching the forum,  and reading up on rotary encoders.  But not sure how to do this.  Are there any step by step instructions out there on how to wire and setup the code to make this work?

Another question,  when the PI shuts down and then the next time it boots,  does it remember where the volume was set?

Is anyone else here using Crankshaft/Open Auto and come up with a solution on controlling the volume? 


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