basically, combining a degree in one field with an unrelated field of a new (or rediscovered) interest is difficult, to say the least. I came to computer science from chemical engineering and have found that my degree is almost completely worthless, except that it got me into grad school. personally, the opportunity cost is worth the freedom to pick something i know i'll enjoy throughout my life. but the cost is substantial.
I can only assume this would be analogous to your situation. you may be able to take what you've done in audio engineering and swing your way towards an entertainment area of computer science if that's what you want to do. I'm guessing you'll need to build up computer experience to persuade anybody that you're serious.