We know you've got questions, and if you're brave enough to ask the world for answers, here's the outlet to do so. This week's Ask Engadget inquiry is from is from David, who wants to know if you'd prefer a free cable or a cheaper device when you buy pro audio gear. If you're looking to send in an inquiry of your own, drop us a line at ask [at] engadget [dawt] com. "I work for a small audio-tech company and we're currently getting close to releasing out first retail product, which does surround sound from stereo inputs -- kinda like Dolby Pro Logic, except good. Internally, we're agonizing over if we should include a stereo RCA cable. Of