They're all "safe" notes (scales)

Cantabile
21

I found Andy James on Youtube. Here’s a link to one song, Tonality, where he just noddles on-and-on. This is what started me on the quest for a fretboard without sour notes.

22

https://www.zynaptiq.com/pitchmap/
I am not familiar with this plug-in, but judging by the description it can do trick, though directly on audio.

23

Thanks for the info, Boyan. This would work. I saw one of their Youtube videos (link below) and at 2:00 the presenter shows how a note can be made to sound like another. The package is a bit expensive but it would be a great feature for DJs, In My Humble Opinion. Here’s the link:

I’ll be freeing up next week and will play with muting out notes in Cantabile as Toto suggested.