Boss NF-1 Noise Gate

NF-1 Noise Gate (Boss)

This is a simple noise reduction unit, the first one in Boss compact pedals line-up, and can be used to get rid of background noise and hum during silent passges while playing.

It has been sold from 1979 to 1988, while right now the only compact noise-reduction system is the NS-2.

The NF-1 has two controls: Sens and Decay. Sens (for Sensitivity) sets the threshold for intervention, while Decay sets the intervention time after last signal, from 100 msec to 1.6 seconds.


- Input Impedance: 470 kOhm

- Recommended Load Impedance: 10 kOhm or higher

- Current Draw: 3.9 mA

Schematics for the NF-1 can be found here:

NF-1 Schematic (Free Info Society)

NF-1 Schematic (Schematic Heaven)

Boss NS-2 Noise Suppressor

NS-2 Noise Suppressor (Boss)

This is the successor to the NF-1 Noise Gate and has been sold since 1987.

There are 2 controls “Threshold” and “Decay” and a Reduction/Mute switch: the controls have the same functions as “Sens” and “Decay” on the NF-1. The first one sets the level for the circuit to start working, the second sets the time needed to start after last note. The switch is used to select between two modes: in “Reduction” mode the expander circuit works when the music signal goes under the threshold. In “Mute” mode the noise reduction is always on and when the signal goes under the threshold there is a complete cut-off.

Two important additions are a LED showing if noise reduction or mute is on, depending on mode, and a couple of send / return jacks. Last but not least, there is a DC out: with a power supply and a cable you can use it to power other effects.

NS-2 Noise Suppressor (Boss) Box (italian version)


Input Impedance: 1 MOhm

Output Impedance: 10 kOhms or higher

Equivalent Input Noise Level: -110 dBu or less (IHF-A)

Current Draw: 20 mA

NS-2 on Boss USA site Not much detail here…

NS-2 on Boss Japan site (in english) with manual and some info

Vesta Fire CG-1 Comp / Gate

CG-1 Comp / Gate (Vesta Fire)

This is definitely an odd one… it has a noise gate and a compressor in a relatively compact single package, which is not a bad thing, but can’t work with a battery, which means that an AC adapter is mandatory. I don’t have a shipping box or manual, so I can’t tell if an adapter was sold with the unit: however any standard 9V adapter should work. The box uses electronic, not mechanical switching, and the physical feedback is simply awful: you can’t tell if you have actually pressed the buttons unless you look at the two LEDs. On a more positive note, there is a couple of send/return jacks on the top. While my unit has a light blue color, I’m sure I’ve seen the very same model in black. There were different units who shared the same box and physical structure, i.e. the R-1X Digital Reverb and the D-1X Digital Delay. The company is now called Vestax, and has an impressive catalog of DJ-oriented products, but no stompboxes as far as I know.