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Soundbeam is a $1.99 app (2015) for iPhone and iPad that is an oscilloscope and a spectrogram.

Soundbeam shows the partial intensities as a single line, much like an oscilloscope waveform, but this line shows the partial intensities as the height of the line at the specific frequency of the partial.

Unlike Audacity and the MFJ audio filter, (See my lessons on using Audacity and Using the MFJ Tuneable Audio Filter to Help You Tune a Piano), Soundbeam shows the different partial beats simultaneously, and in real-time.

Watch the full video below:

Soundbeam Video