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If you're planning on streaming via Chromecast etc. then you can generally use the streaming interface to control the output volume, not sure if such a thing exists for other sources though
This. I have my amp volume (physical dial) perma-rolled up just over half way, then control output volume from mac / phone / whatever bluetooth source is in control. Might not be the most audiophile solution, but works well for me...
Is there any gizmo that you can add to an old amp that allows remote controlled volume adjustment?