VIN,

A lot of it can be used by those of us who don't read music. I read in only at the minimal level, but hearing discussions like these and messing around with the whistle helps me learn. Finding out how to make a note lower than the "lowest" is wonderful. There are a few songs I play where I typically "ignore" a lower not, since I play the whistle in a way to avoid going back and forth between the lower and upper octavs through the whole song. Now I might be able to do that and still play the song correctly.