Just wanted to clarify that it's the "one button" approach you are asking for here, since you can already manually transpose and print the parts in each key.

I think this is a really good idea. For those who would find this useful but who do not need all the keys you need, perhaps a dialog with checkboxes for C, Bb, Eb, F, and bass clef, then a "Print all checked" button?

I added instruments in F because that's fairly common (French horn, for example) but there are of course other less common keys, like A for my piccolo trumpet, D for my classical trumpet, G for my alto flute, etc. so maybe the best idea would be a dialog with checkboxes for ALL keys. In your case, you would only have to check 4 boxes then Print All Checked; not too bad, and a lot easier than what we do now.

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