The aim of auch is to visualize harmonics in musical recordings. Many tools show the spectrum, but this tool focuses on one or two specific octaves with an indication of the tonica (the key) and sub-dominant(IV) and dominant(V). It also supports wavelet transformation and resampling to further analyze and clean-up the recording. This way, notes, chords, and harmonics in a musical piece become more clear. Another feature is that this tool can compare outgoing audio (from a .wav file) with incoming audio (microphone). This way, the effect of external filters can be tested. License: GNU General Public License (GPL) Changes: The UNFOLD command simulates an expanding medium, ether, that propagates music from a sender to a receiver. This elastic medium is used to see if there is a fundamental invariable chord in a melody.

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