Electro-Harmonix Mod 11 Modulator Machine Features: 

• Momentary mode for adding quick bursts of effects
• Mode control adds hidden controls into the mix
• Rate knob controls speed of modulation
• 11 great-sounding modulation effects in one pedal
• Durable construction will stand up to the pressures of gigging
• Tap tempo can be controlled with optional footswitch

Experiment with 11 Modulations: 

• Tremolo
• Harmony
• Vibrato
• Uni
• Chorus
• Rotary
• Flange 
• True Zero Flanger (TZF)
• Phaser
• Pitch Shift
• Filter