RJProjects has announced the release of version 1.1 of Aqualizer, a free, open source, parametric equalizer plug-in that was created by Josse van Dobben de Bruyn and Jelle van Mourik as the practical component of a research on digital audio filters. An associated research paper is also available.

Aqualizer is a 32-bands parametric equalizer with the possibility to turn on or off any amount of bands up to 32. It allows the peaking frequency to be entered at will and the band width can be adjusted by turning a knob. Each band has a range of -12dB to +12dB, as has the gain slider. Aqualizer also comes with the Go-function, which logarithmically spreads the frequencies between fMin and fMax over the active bands. This allows for precisely setting the range of the bands without having to do lots of calculations by hand.

Aqualizer is available for Windows as a VST effect plug-in. Source code is included in the download.