Promo Video Soundtrack Composition

I have an existing song that will score a short promotional video, and it needs a creative yet surgical audio makeover before it goes to final picture. The core track is solid, but I want to weave in fresh... (Budget: €30 - €250 EUR, Jobs: After Effects, Audio Editing, Audio Engineering, Audio Production, Audio Services, Music Production, Sound Design, Sound Engineering, Video Editing, Video Production)