Free Music Software: Developer Oli Larkin has released pMix (Mac App Store link), a free sound design tool for Mac OS X that allows you to morph between VST plugin presets using an intuitive graphical interface.

• Presets are represented by coloured balls that are positioned on a 2D plane. The size of each ball and its proximity to the cursor affects the weight of the associated preset in the interpolation.
• Morphing between presets often results in the discovery of interesting hybrid sounds. By constraining sound manipulations within a predesigned “interpolation space” complex transitions can be achieved that would otherwise be hard to manage.
• pMix can load four VST2 audio plugins. It comes with a suite of specially designed plugins which cover a range of experimental DSP techniques (noise generators, FM synthesis, formant filtering, frequency shifting etc). These plugins can also be used in other VST host applications.

Features:

• Realtime VST2 plug-in chainer.
• Live processing of audio input, file playback or instrument plug-ins.
• Unique multi-layered interpolation approach.
• Rich visual control interface with real-time feedback.
• Includes a suite of 9 high-quality audio FX and generators.
• Many options for randomisation.
• Break-point function and “freehand” automation modes.
• Audio file player & recorder built in.
• Controllable via OSC and MIDI.
• Can be used with other applications via Rewire or Soundflower.
• Changes from v0.7 (released in 2008):
• Redesigned interface.
• Supports instrument plug-ins.
• Supports tempo synchronisation.
• Now includes a suite of specially designed plug-ins.

If you give pMix a try, let us know what you think of it!