PSPaudioware PSP Lotary2 v2.1.2

In other words, this is not just another modulation effect! PSP L'otary is capable of reproducing the classic sounds of those famous rotary speakers as precisely as possible.
PSP L'otary2 is also capable of creative new sounds and tones not possible with the original. For example, you could set up both the rotating high frequency horn and the rotating low frequency drum independently from each other, and emulate speakers with a static drum or even a broken horn or drum engine.
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https://www.pspaudioware.com/products/psp-lotary2