Electro Harmonix Mod 11 Guitar Effect

A Modulation Pedal With Eleven Engines Under One Knob

A digital algorithm engine delivers eleven full modulation types from one compact stompbox. Inside the pedal, the engine covers Tremolo, Harmonic Tremolo, Vibrato, Univibe, Chorus, Rotary cabinet simulation, Flanger, Through-Zero Flanger, 4/6/8-stage Phaser, modulated Pitch shifter, and synth-style Filter, running on mono 6.3 mm I/O with Buffered Bypass. The Mod 11 Modulator is the right choice for gigging guitarists and bassists who need chorus, phaser, flanger, rotary, and tremolo voices from one small box.

Hidden Parameters and Envelope Control

Holding the Mode button enters Secondary Knob Mode, reassigning Depth, Rate, and Volume/Colour to alternate parameters — LFO shape, dry/wet blend, and envelope sensitivity — on most engines. Seven algorithms (TREM, VIBR, ROTARY, FLANGE, TZF, PHASE, FILT) include an envelope follower so playing dynamics drive modulation speed or depth in real time. Momentary Mode turns the footswitch into a hold-to-engage trigger for brief rotary whoosh accents.

Connectivity and Power

Standard 6.3 mm jacks handle the audio path, and mains-only supply keeps the chassis sealed.

• Audio I/O: Mono 6.3 mm input and output + 6.3 mm Ext Tap In — fits any standard guitar or bass rig
• Power Adapter: 9.6 V DC, 200 mA, 5.5 × 2.1 mm center-negative barrel (included)
• Battery operation is not supported — mains-powered only
• Current Draw: 150 mA at idle, well within the headroom of common isolated supplies
• Dimensions (W × D × H): 70 × 114 × 53 mm — equivalent to 4.5 × 2.75 × 2.1 in

Tempo and Switching

Tap Tempo runs from the on-board footswitch or from any external momentary footswitch patched into the Ext Tap In jack.

• Synchronise LFO rate to song tempo via Tap Tempo, using either the built-in footswitch or an external momentary switch plugged into the Tap In jack.
• Momentary Mode: Hold-to-engage footswitch setting — Leslie-style blasts and pitch throws
• Buffered Bypass preserves the dry signal across long cable runs and big pedalboard chains, so the unaffected tone stays consistent at the end of the chain.

Algorithm Library

An 11-position rotary selector chooses the active engine; the Mode button switches between two or three sub-modes inside each one.

• Circuit: Digital algorithm processing
• Modulation Types: 11 — TREM, HARM, VIBR, UNI, CHOR, ROTARY, FLANGE, TZF, PHASE, PITCH, FILT
• Univibe Modes: Chorus, Vibrato, Overdrive
• Flanger / TZF: Additive flanger, Subtractive flanger, plus Barber-Pole on TZF
• Phaser Stages: 4-, 6-, or 8-stage selectable
• The included Filter engine runs in Low Pass, High Pass, and Band Pass modes, paired with a Q-Tron-style envelope follower so picking dynamics reshape the cutoff in real time.