Tone Generator Extension troubleshooting

I have been using the KIO4 Tone generator extension (referenced at to create a morse code generator.

Blocks example listed below:

The app works at least for a bit, but I run into an init failed that crashes the app.

(Principles of the app are based on Morse - Google Docs)

I suspect this may be an issue with the extension itself, but perhaps I'm wrong...Has there been issues with tone init failed errors before?

It would help if you enlarge the screenshot of the error thrown; it's almost unreadable.

It says Init failed

and @Scott_Kempen this error has been reported but dev has not replied -
I think @Juan_Antonio can provide support.

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I did a little more digging... It seems like the underlying ToneGenerator is the bigger issue:

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Though if you scroll there was a solution.