What I do is as follows:
0) Make sure that you have made a backup ;-)
1) Make sure on the FM9 itself you check: Setup -> Global Settings -> ToneControlDisplay = IDEAL
2) In FM9Edit go to Tools -> Manage Presets -> Press CTRL+A to select all presets
3) Click Right Mouse Button
4) Select 'Reset Amp Blocks'
5) Grab a coffee, tea, beer or fine bottle of whiskey and wait patiently for the process to finish
6) Look passionately, with love and respect at your FM9 and start listening to even more glorifying tones.
Hope this helps