A pitch reference for tanpura, bagpipes, and anything that needs a steady drone

Pick a root note and Drone Tuner shows you a fat tuning needle that goes green when you're locked in. I built it for my own practice sessions so I could stop squinting at a phone on a music stand. D-pad changes the root, holds it in the 600x600 HUD.
A silent visual click for when you can't hear a beep over the kit
Guitar shapes on a string grid you can glance at mid-strum
Tonight's running order, hands-free, so you stop forgetting what's next
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Tried this against a harmonium drone for class and the +2 cents readout matched my pitch app within a hair. One ask: a way to sound the reference tone, not just show the needle, for bagpipe practice.
The needle going green when you lock the root is exactly what I need on a music stand — used it for a tanpura A and it held dead steady. Does L/R cycle sharps/flats or just naturals?