I want to add the ability to precisely control volume to my Dragonfly Red while connected to my Iphone, but I want to keep it as portable as possible.
I've seen many headphone cables bring a little controller with a volume wheel.
I was wondering if that kind of system could be applied in USB form to make a volume control with a small flat knob about the size of the AudioQuest Jitterbug to put between the Dragonfly and the Lightning adapter.
I'm not sure where to start.
Thanks in advance for any help!