Also check out this post for some uses of the audio spectrum chop to get more complex examples
There are 2 viewers: one is octave based for instruments and singers, the other is a full spectrum viewer.
derivative.ca/Forum/viewtopic.ph … 363#p45934
Get the octave based note compass from that post, Delete the Spectrum viewer… and get the more recent spectrum viewer from the very bottom post in the same thread.