p5.sound.js migration guide

This 1.x/2.x compatibility/changelist repository doesn't mention the major changes to p5.sound.js that were part of the 2.x change. A migration guide, or even a list of changes would be very helpful.

I tried to migrate a 1.11.1 sketch I wrote awhile ago to 2.0.5, and have encountered nothing but confusion. I went to the Library Management popup and chose version 2.0.5. It turned off the p5.sound.js Add-on Library. I turned it back on, and it added a line to index.html for version 0.2.0 of p5.sound. The version seems to be going backwards! And it didn't work, giving an error "TypeError: p5.MonoSynth is not a constructor". There is a link on the Library Management "View the reference for p5.sound compatible with p5.js 2.0.5", which I clicked. The reference doesn't include p5.MonoSynth, so is that deprecated? What do I use instead? (For this issue, that question is rhetorical; I share my experience to illustrate the need for a migration guide. Though if someone has an answer, I might try the migration again.)

If a p5.sound migration guide isn't coming anytime soon, at least mention that it has changed significantly in the list of 2.x changes.