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Overstayer Saturator NT-02A Harmonics Processor

100% analog dual channel harmonics and distortion processor, with tone shaping filters and multiple amplifiers


Product Description

The Overstayer Saturator NT-02A  is the ultimate studio harmonics and distortion processor. Overstayer brings a fresh approach to mix coloring, opening up a new world of sonic possibilities. Great for coloring just about anything, like drums, loops, synths, bass, vocals or even an entire mix. The Saturator’s comprehensive controls can dial in anything from subtle tape compression effects to extreme distortion, making it an indispensible tool in the digital world.

The Overstayer Saturator features a 100% analog signal path with tone shaping filters and multiple amplifiers for a wide of array of character, from subtle thickening to extreme distortion, balanced to taste with an integrated blend control.


  • LOW CUT: A bypass-able 12 dB (2-pole) high pass filter with resonance control.  Wide range sweepable from 30 Hz to 4.7 kHz. This Low Cut helps define the shape of the distortion and harmonics from the stages that follow.
  • RES: The Resonance control for the Low Cut.  Controls the amount of peaking introduced at the cutoff frequency.  With high resonant peaks dialed in at low frequencies, the filter can add huge amounts of low end while cutting sub frequencies below the Low Cut selection.  At max setting the resonance can be driven into oscillation.  This oscillation can be used to tune the resonance to desired frequency and backed off when found.  Monstrous kick drums, giant Dub-style basses, telephone filter effects and self-oscillating harmonics are all possible with the Saturator’s filter section.
  • BOOST: Adds a fixed amount of clean gain to raise low signal levels and/or overdrive the next stage engaged.  It also engages a pad after the Gain amp to compensate for the added gain.  Functions like a clean boost pedal on the front end of a guitar amplifier.
  • SATURATION: Controls the amount of non-linear amp saturation and soft clipping, ranging from subtle harmonic sweetening to extreme analog saturation.  The Saturation section can be bypassed, while still allowing access to filters and the Shape 3 circuit.
  • HIGH CUT: Fixed 6 dB lowpass filter at 6 kHz can be engaged to tame high frequencies especially in high gain circumstances.
  • GAIN: Discrete op-amp primarily provides clean gain, but can be clipped via Boost or high gain settings.
  • SHAPE 3: Activates a Pre and Post emphasis filter to shape the distortion response of the entire circuit, adding 3rd order harmonic saturation.  This functions similarly to tape saturation and can be used in conjunction with the Saturation section or independently.
  • BLEND: This controls the balance between the source signal and the processed signal.
  • OUTPUT: This sets the final output level post-Blend.
  • IN: Master bypass for both channels.

Product Specifications

Condition New
Tube or Solid State Solid State
Channels Dual-Channel
Chassis 19-inch Rack-mount
Rack Spaces 1U
Input Connectors Analog XLR
Output Connectors Analog XLR

Product Reviews

5 out of 5 stars.
Review Count (4)

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A must have for drum tracking. Stays on my kick/snare but also works great on OTK, FOK, or rooms. The tunable low-cut filters and resonance take it to the next level. Plenty of gain stages that let you dial in a wide range of saturation/distortion options. Can be subtle if needed or outright violent when called for.

By John S on June 13, 2023

When it comes to drum bus treatment/processing/coloring, I find this Overstayer NT-02A Saturator to be at least as crucial for a crushing drum tone as a specialty bus compressor geared for such a task. I will also say that my estimation of just how valuable this saturator would be to my now current drum processing chain was grossly underestimated. I consider this Overstayer product to be AT LEAST as crucial to my drum sound as my bus compressor (API 2500)...possibly even more so. Magical!

By Michael K on April 26, 2020

This thing rules. From subtle warmth and density on a group or parallel chain to full on destruction on individual sources, the NT02A is an amazing piece and has become indispensable to me.

By John D on January 15, 2019

The Overstayer Saturator is a "must have" in my opinion. I wish I'd heard about this unit, and company, years ago in fact. Perfect for light saturation on a mix bus or if you want heavy handed drum crunch or distortion on individual channel or instrument groups then you can go overboard with this thing and dial it back till the right parts of the track are peaking the way you want it. forget using 3 or 4 plug in's and distorting your board pre's....with this thing you really have a ton of control immediately at your finger tips! The Res filter is great too for certain things! Since I got this, I basically use it on every song I'm working on whether it be lightly on a vocal track, or bass track, or heavily on a drum track. Even though I record a lot to tape and may use a Fatso for tape sat warmth type stuff, the Overstayer Saturator is really a very handy tool that is totally legit in the way it sounds and operates, especially considering the price point. Now I'm looking at the Modular Channel they make, which is even more of a specific type of unit. Overstayer makes special products for sure! To end this statement...I don't see how anyone would regret purchasing this unit. I've become a fan of their gear quickly and so far have only used the Saturator NT-02A in person. Also, smaller companies like this have something special to them, period. Check out their website and look around at what they have to offer. In the mean time, check my website or Instagram for songs that I'm currently using this on and I'll post about it once tracks are released to the public!!! I love supporting smaller companies that make cool stuff. I should be posting about this unit in December 2018 and early 2019 as I've been working with it a lot lately since I just got it recently! Cheers everyone!!

By Spencer G on November 22, 2018

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