Restrict allowed values for pedal-step

[rettinghaus]

Currently pedal-step allows to hold a decimal value, e.g., 1.6, which doesn't make sense in this context, as there are only three positions possible: -1, 0, 1.
Best would be to only allow these values, or restrict it to integer at least.

[mscuthbert]

I'm guessing you're talking about <pedal-alter> value.

On a standard harp, values below -1 and values above 1 are impossible. Agreed. But non-integer values between -1 and 1 are common in contemporary harp literature both as pedal glissandi (see Takemitsu first example) and to create a buzzing sound through half pedals. Both of these can use 0.5 or other intermediate numbers.

Takemitsu, from Rain Spell

ALİCAN ÇAMCI dissertation (available online)

I don't believe we have a -1.0 <= x <= 1.0 restriction currently available in MusicXML -- I will look for that.