Hi. I'm kind of disappointed that one of the most versatile blocks in all of Minecraft gets very little love. I see very few mods improving these musical cubes, and I'd like to see an array of new features for them.
How about new instruments? There are only five different instruments total currently, the Piano, Bass, Stick, Bass Drum, and Snare. Not exactly orchestra material. I know a lot of people make good with these sounds, but I know a lot of noteblock composers are, if only secretly, itching for more power.
An easier way to select what note you're going for would be nice as well. I remember one mod that let you select the note easily.
Also, before I close this, and to answer a potential caveat with a proposition: If anyone is willing to work on a noteblock overhaul mod, I am more than capable of designing the new instrument data, using lo-fi technologies like Analog and FM synthesis. Take care and good luck!