A lot cooler." Westmoreland originally got his knob decals from Schutt, the football helmet manufacturer. But in 2007 he got cold-called by a guy named David Sulecki, a former stockbroker and ...

There are pushbuttons to change device settings, rotary knobs for frequency tuning and volume control, and sliders to adjust things like gains and bandwidths. All of these are read out by an ESP32 ...