Fingerboard Explorer — Fiddle
Tap any note to light it up across the GDAE fingerboard.
An interactive map of this chair's fingerboard in GDAE: tap a note and it lights everywhere it occurs, so the 4 strings stop being 4 separate strings to memorise.
Nothing marks these positions on the instrument itself, which is the whole difficulty — use this to see how far a shift actually travels before your ear has to make the same judgement unaided.
Every note a groove asks this chair for is somewhere on this board already — the parts engine just names which ones.