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SPEAR is an application for audio analysis, editing and synthesis. The analysis procedure (which is based on the traditional McAulay-Quatieri technique) attempts to represent a sound with many individual sinusoidal tracks (partials), each corresponding to a single sinusoidal wave with time varying frequency and amplitude. Something which closely resembles the original input sound (a resynthesis) can be generated by computing and adding all of the individual time varying sinusoidal waves together. In almost all cases the resynthesis will not be exactly identical to the original sound (although it is possible to get very close). Aside from offering a very detailed analysis of the time varying frequency content of a sound, a sinusoidal model offers a great deal of flexibility for editing and manipulation. SPEAR supports flexible selection and immediate manipulation of analysis data, cut and paste, and unlimited undo/redo. Hundreds of simultaneous partials can be synthesized in real-time and documents may contain thousands of individual partials dispersed in time. SPEAR also supports a variety of standard file formats for the import and export of analysis data. Read more in the ICMC paper "Software for Spectral Analysis, Editing, and Synthesis." (pdf) or in the dissertation paper Spectral Analysis, Editing, and Resynthesis: Methods and Applications.

WaveSurfer is an open source tool for sound visualization and manipulation. Typical applications are speech/sound analysis and sound annotation/transcription. WaveSurfer may be extended by plug-ins as well as embedded in other applications.

Sonic Visualiser contains features for the following: * Load audio files in WAV, Ogg and MP3 formats, and view their waveforms. * Look at audio visualisations such as spectrogram views, with interactive adjustment of display parameters. * Anno

Swedish house mafia explaining the production and creation process of "one"

MixMeister BPM Analyzer is a free program you can use to determine the exact BPM (beats per minute) of any song. BPM Analyzer allows you to: Calculate extremely accurate BPM counts for any songDrag and drop music files from Windows ExplorerDisplay and sort files by Title, Artist, or BPMUpdate ID3 tags in your music files with exact BPM informationEasily print BPM reports for your entire music collectionExport BPM counts for use in other programsFree to use and distribute for non-commercial purposes

MelodyCatcher makes it easy to enter a melody (even if you don't know how to play the piano) and search for it on the Internet. To get started, play the wanted melody (click the keys on the piano), listen to it ("Play" button or your space bar), correct it when needed (by deleting notes or dragging them up/down), and search ("Search" button or your enter key).