I remember ages ago I had keyboard with big scroll wheel on the left , super convenient. Currently due to many sources (PC, console, occasional synthesizer, BT

I remember ages ago I had keyboard with big scroll wheel on the left , super convenient. Currently due to many sources (PC, console, occasional synthesizer, BT receiver) I just have small mixer between my PC and speakers and it is super convenient. I actually considered hacking something akin to 3-4 encoders with display showing current app making sound and giving option to change the volume of that app