Create piano sound by hertz(HZ)

MIT App Inventor Help
1

I'm finding a extension about generate sound by hertz, for example: 400hz sound, 600hz sound.

Extention in this page can generate sqare wave and normal sound wave.

However, it's not good to listen. If the sound is piano that will be great. I'm finding a extension which can do it. or if I have piano sound, is there any way to change pitch? thanks a lot.

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I find another extention
(In 2016/1/8 1:15:41 am. 3rd file)
https://groups.google.com/g/app-inventor-open-source-dev/c/M7NookKPhQQ/m/WCN5yak3EAAJ

This extension can change pitch of sound. So if I prepare piano sound that can generate any
other pitch piano sound. (but high pitch sound will shorter than low pitch sound)

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