Thank you for your feedback.
I don't have any detailed documentation available at the moment, as this is currently just a prototype. However, your feedback helps motivate me to improve the documentation in the future or perhaps even create a video tutorial. For now, though, I have provided a Blender file here -> Onlyblends.Examples that demonstrates how to create a custom oscillator using Geometry Nodes and then turn it into a sample using Mixer Nodes. I will improve the mixer extension to fit the Blender 5.2 official sound nodes (July). I intend to include more comprehensive documentation at that time as well.
Love these nodes but in 5.1 they caused a strange and pretty severe bug where blender would frequently crash on undo. Spent awhile trying to figure out where the problem was coming from and it seems it something to do with the depsgraph breaking, Node_Info properties, resulting in "EXCEPTION_ACCESS_VIOLATION" .. I was about to file a bug report thinking it was a 5.1 bug, but then disabling all addons fixed it and then i narrowed it down to this addon as the cause of the bug. Luckily the noise nodes just turned into node groups. Hope this is helpful, thanks for the addon!
I'm maybe doing something wrong but I'm getting baked down key frames on every frame. Reading "Doesn't use built-in baking, just copy-pastes all keyframes from selected strips quickly." I thought that meant you'd end up with the same result as if you copy-pasted your keyframes across NLA strips, and that's not the case here, or? I really really need the ability to merge NLA strips without baking and still work on the curves which I was hoping I could do with this extension.
Wow this is exactly what I've been looking for! Everything I need is here and I've figured out how to get sound to the speaker object, but I'm somehow not able to get sound(sample) out of the "object to sample node" no matter what kind of data type or attribute type I try, which is the main thing I need to do haha... I'd love it if there was some more documentation or tutorials for this. I've never felt closer to my dream of generating sounds procedurally with geometry nodes, this is awesome!