I think the ringing noise itself is actually great! If you are familiar with using a parametric EQ tool: I think if you throw it into Audacity or Adobe Audition or something and use an EQ to soften the higher frequencies it'll accomplish the discomfort while becoming a little easier on the ears. If you haven't messed with EQs before, they aren't so scary, you could probably understand what you're looking at with one after a quick google.