This is a very great tool! The visuals are really cute and cool!
If I could make some QoL suggestions:
1) Can you make it so the "Randomize" button doesn't affect the volume, or at least make that a toggleable option? I got jumpscared a few times after pressing the Randomize button after I turned down the volume on a previous sound.
2) The UI shows the last button you pressed (e.g. Sparkle, Boom, Impact). I can tell at a glance what sound I'll get when I attempt to export the WAV file without needing to press the export button to see the filename.
3) For the sliders, have the option of clicking anywhere on the bar and making the slider "jump" to that position. Might be easier on people so they don't have to always click and drag the handle to adjust a particular parameter.
It's OK if these aren't doable or you aren't interested in implementing these suggestions.
Thanks so much for this tool!