Recently, ive come across a reading that said tracking on a 424mkIII should be done at the "high" tape speed to cut down on tape noise. Honestly, thats a button on my portastudio that I've never bothered to touch. I guess my question is does it get rid of any more noise, and if so what do I need to know to use it other than flipping the switch (do I have to put it back on normal for playing tracks and mixdown?)?