Simple Chorus was created as part of Christian Budde's Delphi ASIO & VST Open Source Project. It is one of several examples and the full source code is available. The effect itself is nothing more than a simple chorus implementation with up to 8 stages, speed 0.01-10 Hz and a depth of several octaves (frequency dependent). A mix parameter controls the balance of the sound (0% = dry, 100% = wet). Additionally a drift parameter controls the stereo width and the thickness of the sound.