The aim of auch (audio-checker) 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, sub-dominant(IV), and dominant(V). This way, notes, chords, and harmonics in a musical piece become clearer. It also supports other types of transformation (like wavelets, surface waves, strings, resampling, etc). Another feature is that this tool can compare incoming and outgoing audio to test external filters. License: GNU General Public License (GPL) Changes: This version adds surface waves to the tool. Both transformation and visualization of sound on different surfaces (such as rectangle, circle, hexagon, and triangle) are supported. The results are known as "Chlandi patterns". The transform supports both pre-recorded as live sound, so you can have an open microphone visualizing sounds. The documentation gives you a how-to, some examples, and a movie.

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