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From: rbowman <bowman@montana.com>
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Subject: Re: Older Hardware Still Works
Date: 14 Aug 2025 19:19:48 GMT
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On Thu, 14 Aug 2025 12:54:32 +0100, The Natural Philosopher wrote:

> I'm messing with a pi PICO at the moment for PWM, and crude audio looks
> entirely possible - especially if you stored the waveforms in flash to
> avoid having to calculate them in real time.

https://github.com/cleversonahum/dtmf-generator/blob/main/dtmf-
generator.py

I didn't read it carefully but I think this would allow you to create 
a .wav for each digit.