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 Adder by ConcreteFX is a Virtual Instrument Audio Plugin. It functions as a VST Plugin.
Product Adder
Developer ConcreteFX
Price (MSRP)
No Longer Available
Type / Tags Synth (Additive)
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
- Released
Supported Sample Formats (loads or saves) include


  • Adder uses 32 partials, each partial can use one of four different waveforms. Sine/saw/triangle and square waves are initially built in but you can use any small sample as a waveform (300 waveforms are supplied with Adder for your use).
  • Partials - each partial has it's own volume, harmonic, tuning' FM & phase settings, and each belongs to one of eight volume and pitch group. These groups are use in the modulation matrix so partials can have different volume, pitch & FM envelopes / LFOs, etc.
  • Samples - Adder's built in sample loader allows to load in any short 16 bit sample. Samples can be looping or single shot and can be re-triggered using step sequences. A sample shaper allows filtering, reversing, distortion, etc. of any of the samples.
  • Filters - two 12/24 low/high/band pass/band reject + ring mod or comb filters. Each partial can be sent to either or both of these filters. These filters have built-in distortion and waveshaping and can be use in serial or in parallel.
  • Fat Mode - in this the first sixteen partials are doubled and de-tuned so to create fatter sounds. Combined with stereo widening this creates much bigger sounds.
  • Playing Modes - Adder can work in poly' mono or legato mode.
  • Modulators - Adder has eight envelopes, step sequences and LFOs. Envelope can have up-to 32 stage, each stage having variable slopes. Each envelope has user-definable loop & release points for complex patterns.
  • Modulation matrix - a powerful modulation matrix allows you to modulate all the controls using envelopes, LFOs, step sequences, any MIDI controls'velocity, note played and in/out volume.
  • Effects - Cross delay, chorus/flanger, 3 band equalizer and compressor effects.
  • Adder comes with 160 presets (more to follow) and manual in PDF format.
Latest User Reviews Average user rating of 4.50 from 2 reviews

Reviewed By kuniklo
May 31, 2004

I picked this up in a bundle with Unison and Adder for $70 from ConcreteFX. I wasn't expecting to get much use out of this but I've been very pleasantly surprised to find that this is my favorite of all the additives out there.

First, I love ConcreteFX's unconventional GUIs. They're one of the few developers bold enough to abandon the hardware-style guis most developers favor. Their guis are more simpler and clearer and appear much more at home on a computer screen.

Second, this is easily the best *sounding* additive out there right now. I've been pretty disappointed with the new additive synths that have come out recently because, while they offer tremendous flexibility, they just tend to sound thin and hollow. Adder has a thick, rich sound that holds it own against a good subtractive synth.

Third, the modulation possibilities are mind-boggling. Adder includes a step sequencer, a HUGE mod matrix, fm modulation among all of the partials, a full-featured fx section, and a good randomizer. The gui is so straightforward that it isn't immediately clear how deep Adder can be, but the possibilities are endless.

Fourth, at a price around 1/3rd of the competition, Adder is scandalously cheap. It would be well worth the $200 or so other companies charge for their additives but at the current price it's a must (even more so with the current bundle that throws in Unison/Micron and Digital for no extra charge).

Documentation is somewhat sparse but adequate and the gui is very intuitive for a synth of this complexity.

Adder comes with a somewhat smaller preset library than the other additives but there are a lot of very commanding presets in the library.

ConcreteFX synths are highly underrated and the unconventional guis and low prices probably make people take them lightly. Don't make that mistake.Read more

Reviewed By x_bruce
January 26, 2004

Adder is another excellent VSTi from ConcreteFX. As many others have
ConcreteFX have tested the waters of additive synthesis with their
contribution, Adder. First, Adder follows in it's siblings footsteps with
clean, two dimensional interface. Sections of the synthesizer are clearly
marked and easy to learn quickly.
The sound engine for Adder consists of four possible places to load
data or analyzed sample data. With adder it's bet to keep the samples
mono and short. You want to look for what makes the sound and upload
it for conversion to additive format. This section allows you to phase,
several frequency modulation controls, additive and sample effects like
reverse. You don't need to use samples, in fact, on the opening screen
there are several traditional (for additve) settings such as vocal,
bells, and other pre-built waveforms to plug into a sound. In use they
are excellent ways of working without converted samples to create rich
sounding timbres.

An area that may be of debate and confusion regarding Adder is its
designer's choice to us 32 waveforms rather than the typical 128 or
more found in other additive synths. There is a reason however. Rather
than set up higher numbers of waveforms ConcreteFX has chosen to let
samples or internal preset waveforms have dramatic effect as you
manipulate the frequency ranges within Adder. It's very powerful and
can, as additive is so capable of doing, rip apart an semblance of the
original timbre, creating EBM style sounds all the way to soothing
ambient timbres. Leads and basses are strong as well although the
overall sound of Adder is a bit more digital than some of it's
competitors. As with this new breed of additive synths, Adder is it's own
idea, using additive theory in several ways and because of this
sounding and behaving differently than other additive synths to date.

There are enormous programming possibilities with eight LFOs, eight
variable step sequencers, a mod matrix, FM matrix, the previously
mentioned sample area where converted samples become additive
building blocks for timbres. There's also delay and modulation effects, a
slick randomizing section - you can go from subtile to wild and that's
just one section. You also have a section of the interface that allows for
two multi-filters with cutoff Q and and distortion on filter 1 and cutoff,
distortion and ring modulation on filter 2.
Above these controls are tuning and additional controls for filters and
other timbre shaping.
Wave manipulation is in the upper left site and controls individual
volume, harmonic, semitone, volume, pitch, wave response and filters,
all that can be graphically set up. In effect you have 32 oscillators to
work with, each harmoncially different to start with and capable of
having substantial synthesis applied to each group.

ConcreteFX took a promising additive system in Ethereal and unleased
a new way of thinking additive.

Highly recommended.Read more


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Average user rating of 4.50 from 2 reviews

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