Actually, I know how to use it, I just dont know if I know how to use it correctly. I just got it today. Ive been playing with it around the house. I know how to read the SPL reading, setting it to the correct SPL the the knob and all. The "A&C weighting" doesnt make a whole lot of sense but I know which to use. I get teh slow and fast response. I got that down quick. I just dont know how to use it in the HT. What am I supposed to use for calibration? I dont have VE or Avia. I dont feel like going back to the store to get one of them either. The only thing I have is the movies with "Optimode" and I was under the impression that it was no good. For what, I dont know. All I really want to check is the bass response in my room at the listening area. Whats the quick fix? Oh yeah, I have a tone generator on my computer. I could burn a few tracks on a CD, but my DVD player and Xbox dont like CDRs or CD-RWs. UGH! Woops, I also think Im going to need the RatShack SPL meter correction numbers. I dont know about the digital, if it needs correction. Who cares about teh digital meter anyway, I got the analog meter.