Tom,
I think you will really like the APC. I put one in two years ago and one place it helped was with pc based music. Often I would get so much jitter when my laptop was plugged in, the dac could not process the signal. I could only run the pc on battery power (for maybe an hour). After putting in the conditioner, I was able to run a 96khz signal to the external dac with no noticeable jitter with the laptop plugged in. I was a convert to power conditioning after that.