Issues found during first testing #2

Hi Script Tiger :)
It's obvious that you're devoting a lot of time and love to this project. I did find some issues during first testing in Windows --

• Would be nice to retain Save location between launches. Currently reverts to User Documents folder each time.
• My level targets wouldn't change the defaults after Save on exit from dialog.
• Error popups could just show numbers (explanations could be moved to instructions).
• Peak of one of my test files exceeded the target level by .3 dB.
• Status during a run could be made more evident, perhaps by color changes.
  Thanks for offering this wonderful tool to audiobook producers!