What's the noun for microtonal? Here's the word you're looking for.
microtuner
An electronic device or audio software endowed with microtuning capabilities specifically designed and used to modify the tuning of musical instruments, hence allowing for microtonal scales, just intonation scales and tunings other than the twelve-tone equal temperament to be played.
A high-precision mechanical tuning device found on some vintage brass and reed instruments.
“These contained monophonic lines in microtone tunings based upon speculations by the composers regarding Mozart's melodic writing.”
“It's a thrilling disconnect, a heady hybrid of the Welsh Valleys and those microtone specialists, Le Mystère des Voix Bulgares.”
“Each track is a deliberate layering of textures and elements, with every microtone sounding as fussed-over as the sculpted icing on an elaborate wedding cake.”