Infinite sustain pedal for practicing scales over drones: EHX Freeze and alternatives | The Gear Page
Electro-Harmonix Freeze Sound Retainer Pedal at Moore Guitars
Electro-Harmonix Freeze Pedal Review - Guitar Space
Electro Harmonix Freeze
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Guitar Pedal X - GPX Blog - TC Electronic's Infinite Sample Sustainer Pedal is a Cool New Evolved Layered Fade In/Out Freeze / Sustainer Effect with added Reverb and FX Loop