This is the song that first comes to my mind when I think of tremolo, thanks to the movie "Christine", I've been a fan of that movie since I was 5 or 6. I know it's a tremolo from an amp, I searched the web to see if I could find some info in the amp used in this recording but nothing came out. So, what kind of tremolo is this? the softer sine wave of a bias trem or the more choppy/square wave type of the optical trem? If I would thake a chance I would say it's a bias trem but I don´t have experience with tremolos. What do you say?