Volume Knob Smart Control

I have existing volume control knobs in 4 locations in my home. I would like to make these smart. I have converted my entire home to smartthings compatible switches, outlets and lights. The only remaining dumb items are these stupid volume control knobs. Any suggestions on what product(s) I can use to make these controllable from smartthings and/or my phone?

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It will depend on what exactly they are controlling.

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They are controlling in ceiling speakers.

Brand and model?