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Correct linear distortions of a perspective and adjust the angle of the horizon. The program can be installed as standalone and a plug-in as well.
Developer: Two Pilots
Free to try; $29.95 to buy | Windows XP
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Eight-channel Audio Spectrum Analyzer Real-time FFT, OscilloScope, Frequency counter, voltmeter, noise and distortion meters, phase shift meter.
Developer: Oleg Ya. Shmelyoff
Free to try; $499 to buy | Windows 95/98/ME/NT/2000/XP
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Sound Effect Maker can create sound effects for sound file. It supports the sound effects such as chorus, compression, distortion, echo, flange, gargle, parametric equalizer, reverberation.
Developer: DigitByte Studio
Free to try; $29.99 to buy | Windows 98/ME/NT/2000/XP