Nut, sorry but you're going to have to make your judgments a bit more quickly than first/last half. Since the rotational speed of a CD varies from about 480 RPM(inner grooves)to 210 RPM(outer edge), the "benefits" will appear and disappear every couple tenths of a second.
Yes, I realize that...I wasn't actually being serious about trying the pen. I apologize and hope nobody is expecting me to post any results.
Thank you though, JohnK, for taking the time to set a nut like myself straight. Good to know that no matter how crazy or stupid the question or comment, there is always someone on this forum willing to help
