WaveSurfer – an open source sound visualization and manipulation tool. The voice analysis views are great.
VoiceSync – a research initiative that uses voice, sound, music, shape and color to improve our vibrational perception. some of neat cheap visualization/feedback tools for the PC (also some granola crunchiness)
Voice Analysis – The voice analysis algorithms used in the Singing Tree measure pitch, noisiness (ambiguity), brightness, energy, and vowel formant. These algorithms were written by Eric Metois, four of which were part of his DSP toolkit used in several other projects and his Ph.D. thesis [30]. In this section, I will describe how these algorithms work and the information they send to the Singing Tree. I will also discuss alternatives where applicable.
SONIA V2.6 for Java and Processing 0068 – Sonia is an external Library (API) for the Processing platform. It may also be included in any Java project. The Sonia Library provides advanced audio capabilities such as multiple sample playback, realtime sound synthesis, realtime FFT (frequency) analysis of the microphone input, and writing .wav files from samples.
Aglaophone – A system for real-time analysis and processing of sound