The Belcat CMP-509 Vintage Compressor is a compact analog compressor pedal from Belcat. A compressor evens out the differences between loud and quiet notes, and RockBoard's PedalPedia describes the CMP-509 as offering precise Attack and Sustain control, helping to smooth out unwanted frequencies and provide a high quality signal1.
Controls
The CMP-509 keeps things simple with two knobs1:
| Control | What it does |
|---|---|
| Attack | Shapes how the compression responds to the attack of each note |
| Sustain | Sets how much the pedal holds and evens out the signal |
RockBoard's PedalPedia describes the pair as offering "precise Attack and Sustain control, helping to smooth out unwanted frequencies and provide a high quality signal"1.
Power and bypass
The pedal runs on a 9V DC, center negative supply and draws 11mA, a light current draw that fits comfortably alongside other pedals on a typical power supply1. Switching is true bypass, so the compression circuit is taken out of the signal path entirely when the pedal is off1.
The CMP-509 is housed in a robust solid steel casing, which is worth knowing if you plan to mount it on a board where weight and durability matter1.
Videos
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Questions
Is the Belcat CMP-509 true bypass?
Yes. Belcat describes the CMP-509 Vintage Compressor as having true bypass functionality, so when the pedal is switched off your guitar's signal passes straight through to the amplifier without passing through the compression circuit.
Is the Belcat CMP-509 analog?
Yes. The CMP-509 is an analog compressor pedal. Its circuit type is listed as analog on the product's PedalPedia listing, meaning it shapes the signal continuously rather than converting it to digital and back.
What power supply does the Belcat CMP-509 need?
The CMP-509 runs on a 9V DC supply with a center negative plug, the standard arrangement used by most compact pedals. It draws 11mA of current, which is a light load that most pedalboard power supplies can handle alongside other pedals.
What controls does the Belcat CMP-509 have?
The CMP-509 has two controls, Attack and Sustain. Belcat describes them as offering precise control that helps smooth out unwanted frequencies and provide a high quality signal. Attack shapes how the compression responds to the start of each note, while Sustain sets how long notes hold.
Sources (1)
- CMP-509 (Vintage Compressor) by Belcat, RockBoard PedalPedia, 2026