Seymour Duncan Shapeshifter is 'a beast of a tremolo'

Seymour Duncan has added the Shapeshifter, a feature- and control-heavy tremolo, to its range of guitar pedals.

Combining LFO shape and wave dials with stereo phase control AND three separate ways to control the tremolo effect speed - a straight dial, tap tempo footswitch and a further dial to multiply tap tempo up to x4 - Shapeshifter does appear to offer an unusually wide latitude of effect, from classic sounds to extreme chop, stab and backward swell effects.

Shapeshifter controls

Shape and wave controls: Tweak every dimension of the LFO, from wave shape to symmetry, to create a range of possible sounds and effects. You can continuously blend from sine wave to triangle wave to square wave or choose which specific part of the wave you want emphasized by the effect.

Phase control in stereo: Continuously adjust the phase between left and right output channels from 0 to 180 degrees. Try cranking the Phase and squaring off the Wave and it sounds almost like a stereo delay.

Tap tempo with LED rate indicator and Ratio Option: To control the tremolo speed either directly rotate the Speed control, use the Tap Tempo footswitch with LED rate indicator, or use the Ratio option to dial in speeds up to 4x faster than your quickest tap.


  • Distortion Circuitry: Glass diode, back-to-back stack.
  • Bypass: True bypass
  • Gain Control Range: 8dB to 36dB.
  • EQ Center Frequencies:• Bass - 90 Hz +/- 11dB• Mid - 750 Hz +/- 11dB• Treble - 2.1 kHz +/- 12dB
  • THD @10mVrms input @ 1 kHz with 12 dB of gain: 0.15%
  • Noise referred to input: -
  • Max Output before Saturation: 0.6Vrms
  • Input Impedance: 470k Ohms
  • Output Impedance: 1k Ohms
  • Power: 9V battery or external 9 to 18V Regulated DC Adapter (center negative)
  • Current consumption: 4.5mA
  • Dimensions: 2.61" X 4.90" X 1.45"
Will Groves

I'm lucky enough to be MusicRadar's Editor-in-chief while being, by some considerable distance, the least proficient musician on the editorial team. An undeniably ropey but occasionally enthusiastic drummer, I've worked on the world's greatest music making website in one capacity or another since its launch in 2007. I hope you enjoy the site - we do.