Keeley Halo Andy Timmons Dual Echo Signature PedalAndy 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