Product Detail Electronically the OCTAVIA is an analogue circuit with the properties of a frequency doubler, envelope generator and amplitude modulator with addition frequency shaping filter circuits. The effect produced is subtle to wild depending on the settings used and will respond to the attack of the player. A clean tone from the guitar with say the tone rolled control rolled off will produce 'ring modulated' overtones that characterise the solo to 'Who knows'. The sound is tangibly different if a fuzz unit is in front of the Octavia: an upper octave double is created, clearly demonstrated in the solo to 'Purple Haze'. The bright harmonics are more controllable if the neck pickup is selected and the tone control set to roll off the treble. The effect really comes into it's own on the top E and B strings from the 7th fret up. . The "Roger Mayer Octavia Rocket Series - Octave Effect Pedal" is best product for you. We recommended Roger Mayer Octavia Rocket Series - Octave Effect Pedal