In the early 1980s, Brian Eno invented an effect called “Shimmer,” which was popularized in U2’s The Unforgettable Fire (1984). The effect mixed ambient reverb and octave effects in the reverb’s decay.  The 3 Series Octave Reverb is JHS take on this classic effect that has been used for decades to allow the guitar to create pads and textures that fill out ambient space.  Toggle up layers in upper octave sounds, while toggle down layers in lower octave sounds.