Im almost ready to start to preserve in tape some of the best songs that I have in my vinyl collection, but before that, need to decide tape speed and 2 or 4 tracks so, in your experience, what is better to preserve the best sound quality, to record in 2 tracks at 7 1/2 or 4 tracks at 15?. My point is to know if is better to go to the fastest speed, or records in 2 tracks instead of 4. i know that optimal should be 15 speed / 2 tracks but is the difference notorius against the other options mentioned before? .Tanks