The use of quarter tone, or micro tone in general, is a basic element in oriental music making. It is also becoming a wide object of research in the occidental music. Unfortunately it is missing in SP. Have been requesting for years incorporate micro tones ( mainly quarter tone) symbols both for notation and playback in SP. Was told teams were working on it but so far nothing released.
Please advise if still planned and when should be expected.
Expect a positive reaction.
You can expect this feature to be available in 6.0. To enable it in 6.0, look under Navigation Menu > App Settings > Microtonal Notation. It will arrive in a few more weeks and will be a free update as always.