Mark's post was deleted, but the question was very reasonable...

" ... are you talking about range only?"

I was thinking about range only.

The reasons for that were twofold ... the instruments I looked at with special scales always did something sane with notes outside of the scale, e.g., they play a note from the scale (whether that's sane is moot), or they play a trill or similar ... other instruments might not. I also felt perhaps the harmoniser may perhaps a better way to manage such instruments. I have to say though, that I'm not at all certain that I'm right about that.

I think that constraints within scales may be being over-clever of over-proscriptive, but again I may be wrong.

Jazz relative beginner, starting at a much older age than was helpful.
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