From Electro Harmonix;

Generate slithering “Axis Bold as Love” textures. Use Filter Matrix mode
to manually flange your sound or select a flange point allowing
musically frozen tonalities. This is the only pedal where lush Stereo
Flange and Chorus work together seamlessly for the richest modulations
that undulate and flow over any stage or recording. Colorful and
seductive in stereo.