[jagman]

One more question. The cable that plugs into the RS digital SPL meter has a 1/8" male plug, right? That's what I used last night and it seemed to fit properly. The reason why I ask is the photos in the help menu show a single phono (RCA) plug going into the SPL meter, but the receptacle looks nothing like a female RCA jack.

And, just to clarify, I have a male 1/8" mono to male 1/8" mono cable. If I plug one end into the RS SPL meter, the other end should go into the female end of a male 1/8" mono to female 1/8" stereo adapter... basically a Y-adapter with one male 1/8" plug on one end (which goes into the LINE_IN on the sound card) and two female 1/8" plugs on the other end (one of which will accept the male 1/8" male end of the wire coming from the SPL meter). This would be simple, but my cable is short, so it isn't my first choide.

Another option would be to use the 3' male 1/8" mono to stereo female RCA cable I used last night with the 1/8" end plugged into the sound card. I'd also use the 3' male 1/8" mono to male 1/8" mono cable previously discussed and have one end plugged into the SPL meter. This way there would be one male 1/8" mono plug on the free end of the wire coming from the SPL meter and two female RCA plugs on the free end of the wire coming from the sound card. This means I would then have to get an adapter with a female 1/8" plug on one end and a female RCA on the other. The upshot is a stereo adapter would leave the soundcard and a mono wire would leave the SPL meter. This would work better for me since the combined length is 6' and not 3'.

Would any or both of these options work?