Electro-Harmonix Freeze Sound Retainer Compression Guitar Effects Pedal The Electro-Harmonix Freeze Sound Retainer pedal delivers infinite sustain of any note or chord at the press of a momentary footswitch. Release the footswitch and again you are sample-ready. The Freeze Sound Retainer pedals' 3 selectable decay ratesâ€”including a latch modeâ€”guarantee liquid smooth tonal transitions. Hook the E-H Freeze Sound Retainer to your favorite pedals for a sonic collage unlike anything you've ever heard. The Freeze Sound Retainer is almost like Electro-Harmonix adding an extra musician to your band.