Simple Media recently released several free VST instruments for Windows.

Clavia Lab is a hybrid analogue and physically modelled electric piano.

Features include:

• Control over source tone and resonance.
• Complex comb filter style delay model used.
• Separate amp control.
• Various controls for modulation.
• 8 note polyphonic.

Spook Keys is designed to re-create the sound of a 'Theremin' and can be controlled using either a MIDI keyboard or a mouse to drag the glowing spot across the 'chart' for more authentic 'Theremin' style play.

Spook Keys also includes the following features:

• Sine, sawtooth, triangle and pulse waves.
• Variable key in and out response.
• Variable LFO for vibrato and tremolo.
• Pan, chorus (detuning), stereo spread and glide controls.
• Filtered, ping-pong, stereo delay.

The Shepherd: Kill Bill has a tune in its soundtrack by Ennio Morricone featuring a haunting and evocative whistling. This 'mini-synth' is designed solely to re-create that sound - just add reverb. This shepherd likes to whistle while he works.

String Thing is a plucked string based on 'Karplus Strong' algorithm with advanced controls and filtering to create a more natural tone.

Features include:

• Controls over plucking.
• Variable bandwidth filter.
• Modulation (MIDI CC).
• Various controls for tonal quality.
• Reasonable CPU load.