TazMan Audio has released TheExtractor, PC VST plug-in that can extract audio information in real-time and convert it into MIDI messages, as well as allowing you to control up to 4 parameters at the same time from a single audio source.
TheExtractor makes it is possible to control a synthesizer/sampler or effect unit (as long as they accept MIDI data) by using audio input instead of a MIDI keyboard.
Features:
2 different pitch detection algorithms.
Note and Beat transient detectors result in an automatic generation of MIDI notes.
Volume and Brightness parameter detection.
Input Gate for tracking just the input signal you want (and ignore low level noise).
Modulation Matrix provides you with the choice to select which MIDI messages (Targets) you wish to generate from the 5 extracted parameters (Source).
Graphical displays of the Input, Pitch, Spectral and Note output parameters.
TheExtractor is a VST plug-in for Windows that can be purchased online for $34.95. Demo version and audio examples are also available.