The Caline CP-51 Rumble Strip is an analog tremolo pedal made by Caline. Tremolo varies the volume of your signal rhythmically, producing the pulsing effect heard on vintage amp tremolo circuits. RockBoard's PedalPedia describes the CP-51 as "a great value vintage style tremolo pedal," aimed at players who want that classic effect without a large outlay.1
What it does and how it is controlled
The CP-51 keeps things simple with two knobs:
| Control | What it does |
|---|---|
| Intensity | Dictates how much of the effect is in the signal1 |
| Rate | Alters the speed of the tremolo1 |
Intensity works as a depth control: at low settings the volume swing is subtle, and as you turn it up more of the pulsing effect is blended in. Rate sets how fast that pulsing runs, from slow swells to quicker shimmers. Because the circuit is analog, the effect sits in your signal path without digital processing.1
Power
The pedal runs on 9V DC, center negative, and draws 30mA. That is a modest draw by pedal standards, so a standard 9V supply or daisy chain output will run it alongside other pedals.1
Where it sits in Caline's range
Caline builds other tremolos besides the CP-51. The Caline CP-62 The Reflector Tremolo and the Caline G-007 Redbelly Tremolo are related pedals in the maker's lineup, so players comparing Caline's tremolo options have several circuits to look at.1
Videos
Guitarworks1000
Syuwari Ritchie
Questions
What does the Caline CP-51 Rumble Strip do?
It is a tremolo pedal, meaning it varies the volume of your signal rhythmically to produce a pulsing effect. Caline describes it as a vintage style tremolo. The Intensity knob sets how much of the effect is blended into your signal, and the Rate knob sets the speed of the pulsing. The circuit is analog and runs on a 9V DC supply.
How is the CP-51 powered?
It runs on 9V DC, center negative, and draws 30mA. A standard pedal power supply or daisy chain that provides 9V DC center negative will run it, and its modest current draw keeps it easy to fit into an existing board setup.
Sources (1)
- CP-51 Rumble Strip Tremolo by Caline, RockBoard PedalPedia, 2026
