Long time, generally happy Capo user.
Just started using an evaluation copy of RipX software, an audio editing tool. I really like how RipX uses the filtering on their spectrogram. They have the main spectrogram and then they have ui-tabs you can click that filter the master spectrogram into potential instruments, bass, guitar, kick, … . If RipX miss classifies an instrument in one of the filters you can tell it the correct filter to use. You can turn on/off the filters on play back to isolate instruments on play back.
It would be great enhancement if Capo could add those type of RipX spectrogram filtering capabilities. I think it would be a big improvement over the isolation tool. I am just talking about the spectrogram not all the audio editing capabilities in RipX. I would recommend the Capo team download the 20 Day eval for future ideas for the spectrogram.