HugeGains: CompositeLab will retain your original sound only if you leave the timing of your clip intact. This means no cutting the video within CompositeLab, no duration changes, no speed changes, etc. You can
retain the sound if you add any sort of effect, such as compositing.
does Compositlab ONLY composite video?
Only!? That's a pretty big 'only'!
It's main features are indeed compositing and grading video, which are two rather large features. If you bought it expecting a fully fledged video editor, I'm sorry to say you've made a misinformed purchase. CompositeLab has never claimed to be anything but a fantastic compositing and color grading tool (which it is!
The best workflow is to edit within your editing program, send only the FX shots to your effects program, and then send those back
to your editor for finishing. That is the most efficient and professional way to go about managing your project.For more on this issue (including step-by-step instructions on retaining audio) check out this fantastic article in the Knowledgebase.