this dark theme still has several non good things:
1. too many unnecessary 3d lines and emtpy spaces
2. pressed buttons don't differ from unpressed ones. for example - can you say what is the selected ratio in compressor? imho it would be nice to have unpressed buttons with same background color as panels underneath
3. own backgrounds for _all_ buttons create unnecessary color "noise" across the UI
4. gray transport buttons..
if i have time i think i could edit this mockup to be more good-looking