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You can't print this with support because there's no way to remove the support from inside the whistle. If peeling up is a problem try printing with a raft. Try 0.25mm layer height.
Try slowing down the print speed. and lots of cooling. If it's not making a note properly then check the hole that you blow through and the sharp edge opposite are clear of obstruction and sharp.
Scaling down will raise the pitch of the notes. It may even push them outside normal audible range.