I was exposed to a technique used particularly for vocals years ago in a recording session. I think this was pioneered at Abbey Road studios and know it was used in the 80's to give singers heavier sounding voices, particularly to get that heavy baritone sound. It's a simple case of recording with the tape running quicker than normal, then when it is played back at normal speed the vocals sound heavier/weightier/lethargic even. I'm using Logic 9 and wondering how I could replicate this technique? or if there is something else entirely different I can do to achieve the desired effect?