Neon Egg Planetarium 3

The Planetarium is a stereo reverb and/or chorus, running into a delay with stereo modulation, running into a compressor with an external sidechain input. It lets you turn any sound into a sea of modulated ambience, then make it pump in time with the music (without the need for a computer or click track).

https://neonegg.com/what-is-the-planetarium/