[LAD] Alpha release of zita-avc1

Zita-avc1 0.1.0 ---------------- 'Analog' style vocoder, inspired by the famous EMS vocoders from the 1970's. Standalone app, using Jack for audio and MIDI I/O. Zita-avc1 uses two sets of 24, 6th order bandpass filters to analyse the voice input and to impose the same spectral envelope on another signal. The filters span a frequency range from approx. 70 Hz to 14 kHz. Filter spacing is 1/4 octave over most of this range. Voiced / Unvoiced detection is based on the power ratio of the high vs low frequency bands. A sawtooth oscillator and a noise source are provided, but normally you should use external signals, at least for the voiced excitation. Bright strings-like signals seem to work well, but anything with a dense 'pinkish' spectrum should do. The voice input should be a clean, full-bandwidth voice signal, speaking or singing. This is very much an alpha version, released to invite comments and suggestions. Future developments may include: - Pitch tracking. - Filter band matrix. - Store and recall formants with MIDI control. - ... See the README for a quick guide. Available at the usual place: <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/zita-avc1-0.1.0.tar.bz2> Ciao, -- FA