Tapestrea is another software tool for learning about frequencies, filters, synthesis, composition and reads ChucK scripts. The reason I find this so useful is it gives visual context to signal processing. This 5 minute demo video gives a quick tour through the software features. For example, a pre-recorded .wav file is played and the frequencies appear in the spectrogram display. The "separate" button creates individual files for each frequency in the .wav file, dividing the files into stable foreground sinusoidal frequencies, bursts or transient events, and background/noise (stochastic events). Extraction of a frequency is done easily by clicking and dragging a window across the segment you want. Sliders make it easy to stretch, loop, synthesize, etc. and give visual/manual control to processing new sounds. However, the Lion roars on this one because though Tapestrea incorporates ChucK programming features, the software does not run on a Mac OSX Lion operating system. Windows, Linux or Mac OSX is necessary. I emailed Princeton and received this confirmation by email.