TrueTone Editor is the tool in the Professional Edition that allows users to correct the results of automatic recognition with a visual comparison of spectrogram peaks to the notes.
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WIDI can work both in real-time and off-line mode. In off-line mode WIDI performs audio to MIDI conversion, taking WAVE, MP3 and other sound files as input, and produces MIDI sequences as output. This gives you numerous possibilities:
> convert a melody from mp3 to MIDI to make further editing possible (some MIDI editors can also print MIDI files in music notation)
> create a ringtone for your mobile phone
> playback produced score with any instrument for training
> upload a melody to your web page as MIDI file to speed up loading time
> make a preview of your mp3 collection (saves traffic on your web site)

WIDI also works in real-time, instantly converting music at the microphone or line input of your computer into a MIDI sequence. Think of this mode as a powerful music processor which allows some non-MIDI instrument (like a guitar) to sound as a violin or a piano or whatever instrument you've got in your MIDI synthesizer.