Available for download, PSPAudioWare PSP L'otary2 is a plug-in that emulates a rotary speaker, such as the kind you'd find on hammond organs. This plug-in is designed for pro-audio production, composition, and mixing.
The algorithm is based on two real-life rotary speakers, the Leslie 122 and the Leslie 147. PSPAudioWare intends this algorithm to be as faithful as possible to the original hardware units, though it is also possible to create timbres unavailable to you in the physical world. For instance, you can control the rotating high-frequency horn and low-frequency drums independently, and fashion novel sounds in the process.
Use this effect on electric pianos, clavs, hammond organs, and more. Process a vocal through it, and you can secure a sound straight out of the psychedelic '60s. This software is compatible with Mac and windows platforms, and it will operate in AU, VST, RTAS, and AAX formats.