A couple of questions..
- What do mean when you say "record audio off the pc"?
- Are you recording straight into the RX7 standalone application?
- What are the Input device and Output device set in RX7's Audio Preferences?
- If you're recording with an open mic, did you remember to turn off your speakers when you turned on Input Monitoring?
[If the speakers are on, the sound will be picked up by the mic when you enable Input Monitoring, creating a feedback loop --
you'd need to monitor in headphones when setting the input level & recording, just as with any DAW]
If that's not it, then I'd need a little more detail on your signal routing [including platform, interface, i/o settings, etc]..