The Doppler Effect is the name given to the perceived pitch change when a sound source moves past the listener. The pitch is higher as it approaches and lower as it moves further away. Examples of this are the sound of a passing train, ambulance or race car.

Spacestation allows you to apply this effect to any sound source so it's useful for sound designers or for musicians wishing to create spatial movement in their sounds/music.

Spacestation costs £10 GBP and a demo version is available.