For a while, I've been working on my own sound editor in snap. I am absolutely not finished, as there is no way to export the sound.
Here's the project link. Note: you do need javascript to use
https://snap.berkeley.edu/snap/snap.html#cloud:Username=ego-lay_atman-bay&ProjectName=sound%20editor
The only uses for javascript is playing the sound (so I can easily pause a sound and resume it), setting the page title to the sound name, and for the effects menu.
This is not finished, and the ui is NOT final. I plan on adding actual sprites for buttons for the effects, instead of a dialog. I still haven't put in all the effects I want (I do want to add an echo effect), some more effect customization, speeding up and slowing down.