The program can handle a single file or multiple files. Just hold down "Ctrl" key when selecting files.
The Note names in channel 10 are the standard General MIDI percussion instrument names.
If your file uses another Drum Set you will have to consult your manual for the instrument mapping for this Drum Set.
The volume can be changed 100% up or down.
100 % down equals not audible note. Works as the note was deleted!
The volume will be changed at all notes matching the settings in the entire file(s).