Oli Larkin has just released pMix (short for preset mixer), a really cool free software for Mac.
pMix is a new composition and performance tool that facilitates the control of multiple plugin parameters using an intuitive graphical interface. pMix hosts four VST plugins and lets you interpolate between presets by navigating a 2D visual environment. Presets are represented by coloured balls that are positioned on a plane. The size of each ball and its proximity to the cursor affects the weight of the associated preset in the interpolation. pMix is easy to use and has some fun features such as automation, real time visual feedback and randomisation.
pMix is a donationware and it is available now for Mac OS X. For more explanation I suggest you to watch the video on its web site.
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