In the words of Keeley Effects:

Andy Timmons mysterious sounding Halo effect is a modulated dual echo sound that has long been kept a secret by the tone wizard himself. Andy spent decades combining and crafting the sounds you can now get from the HALO. Notes from the HALO dance rhythmically, almost creating a reverb diffusion. Those notes are held together with tape-style effects like modulation, saturation and compression. The results are stunning. The pedal comes loaded with his signature delay tone and you can program your own sounds and save them as presets.

Easily bounce between Side A and B on the fly, essentially giving you two delay pedals in one. In addition to Andys signature Halo sound, there are numerous other rhythmic delays including: quarter note, dotted 8th, stereo rack mount analog delay, and a vintage multi-head tape echo. Stunning stereo and pristine sound quality are further enhanced with controls for saturation, tone, and shelving filters that give you the ultimate delay pedal.