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With the CP52a Alctron brings a wonderful minimalist approach to 500 series compression. The CP52a's simple "above" and "below" LEDs simply tell you whether the audio level is above or below the threshold leaving your compression decisions up to your ears instead of your eyes. There is also a "clip" LED to tell you when your signal is getting too hot. The "fast/slow" switch allows for a quick and easy choice of attack and release settings. The threshold, ratio, and output gain are fully variable. There is also a HPF at 100Hz, a polarity switch, bypass, and 48v on board. The 48v switch is a rather unique feature for a compressor that pairs nicely with in-line preamps such as Alctron's MA-1!