A free program for Windows, by Acon Digital.

Multiply is an audio effect app that lets you change the pitch and the volume of multiple voices at once. You can use it to create a wide variety of sound effects and musical phrases.

It offers a powerful and free chorus effect that offers a unique twist in its processing. It employs a phase randomizing filter for each simulated voice, so as to ensure the avoidance of unpleasant comb filter effects. The effect can mimic the presence of multiple performers playing the same tones simultaneously, widen the spatial image, or create special sound design effects.

With the capability to simulate up to 6 additional voices, users can modulate both the pitch and loudness of these voices. The plugin includes an integrated equalizer featuring low cut, low shelf, high shelf, and high cut filters that can be applied to the effect signal. A pre-delay section enables the creation of modulated and diffuse echo effects.

Acon Digital Multiply is available in VST, VST3, and AAX formats for Windows and Mac, and it is also offered as AU plugins for Mac. The Windows version comes in 32 and 64-bit variants, while the Mac version is 64-bit and runs natively on both ARM (e.g., Apple M1) and Intel processors. With its versatility and compatibility across different platforms, Acon Digital Multiply proves to be a valuable tool for sound designers and musicians seeking to enhance their audio productions with chorus effects and creative spatial manipulation.