Note type not accurate on import schematic

[Toxicman83]

Describe the bug

I wanted to use a MIDI file to transform it into a flute song but even after selecting al the notes and converting them in flute, the NBStudio is still generating a lot of harp note blocks. In the "song stats", the harp block has a value of "x-7 (-1%)"

To Reproduce
Steps to reproduce the behavior:

1. Add a MIDI File
2. Convert all the notes to Flute
3. Check the "Song Stats"
4. Or import in Minecraft, you will see a lot of Harp note blocks

Expected behavior

It should be only flute notes.

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Additional context
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