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Re:FFMPEG from Zero to Hero by ComodoHacker on Sunday March 07, 2021 @04:00AM (#26374355)
Perhaps https://processing.org/ might be interesting to you.
Re:FFMPEG from Zero to Hero by meow112012 on Sunday March 07, 2021 @04:12AM (#26374403)
Thanks for your information. I have found that [1] may be relevant to my requirements. A bit more work, let's see how far I go with that.

[1] https://processing.org/tutorials/sound/