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 Acon Digital Multiply by Acon Digital is a Virtual Effect Audio Plugin. It functions as a VST Plugin, an Audio Units Plugin and an AAX Plugin.
Acon Digital Multiply
Product Acon Digital Multiply
Developer Acon Digital
Price (MSRP) Free
Type / Tags
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
 1.1.1    Download Released
System Requirements
A Pentium IV or higher
Minimum 256 MB RAM (1 GB recommended)
Windows 8, Windows 7, Windows Vista or Windows XP
A host application that is compatible with VST (32-bit or 64-bit)
 1.1.1    Download Released
System Requirements
64-bit Intel CPU
OS X 10.6 or later
A host application that is compatible with AU or VST
Miscellaneous Information
Copy ProtectionNone

Acon Digital Multiply is a versatile chorus effect with a unique twist. Each simulated voice is processed with a phase randomizing filter so that unpleasant comb filter effects are avoided. The effect can be used to simulate the effect of several performers playing the same tones simultaneously, to widen the spatial image or to create special effects for sound design. Multiply can simulate up to 6 additional voices and both the pitch and the loudness of the voices can be modulated. There is also an integrated equalizer consisting of low cut, low shelf, high shelf and high cut filters that can be applied to the effect signal. An integrated pre-delay section makes it possible to create modulated and diffuse echo effects.

Acon Digital Multiply is available free of charge for both Windows (PC) and OS X (Macintosh). Both 32 and 64-bit versions are available, and the plug-in formats VST, AAX and Audio Units (OS X only) are supported.


Latest User Reviews Average user rating of 4.33 from 3 reviews

Reviewed By Ghost Dog
January 14, 2018

A very nice plugin. Sounds very musical. Love it with my KORG M1 and Wavestation VST plugins (it really brings them to life).

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Reviewed By Sycopation
October 20, 2015

This is a high quality free product. Acon makes good stuff, free or paid.

It's as good or better than the free chorus from Blue Cat (just depends on the sound you're going for). I like it better than the Chorus that comes bundled with Studio One. It's not as good as Uhbik, but hey, u-he rules and Uhbik is not cheap, so that's hardly a slam on this great free product.

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Reviewed By Michael L
August 30, 2014

I started using Multiply at the beginning of the KVR-DC because I was looking for a chorus that produced clean results with complex sounds and included enough relevant parameters. Developers of other effects (EQ, compression, reverb, delay) now enable detailed tweaking, but chorus has not received the same love. Most have the same four knobs. Thus, when I opened Multiply for the first time and saw the GUI, I had high hopes. To my great relief, they were exceeded.

This is quite an imaginative app, which shows the developers took the time to understand the potential and problems of chorus, particularly the need to clearly separate the different voices. Because the app is free you can easily hear for yourself, but I will point out some details I like:

Simple high-contrast GUI with dark or light skins. The dry/effect sliders have a huge range (-48to+18db) with bypass buttons. You can modulate the chorus with pitch or amplitude with rate in Hz and depth in %, in 0.1 increments! You can increase voices from 1 to 6, with "phase randomization" to avoid comb filtering and muddiness. It includes stereo spread from mono to wide, and a delay from 1-500ms. It has a +/- 12db EQ with low/high cut and shelf. Undo/redo and A-B compare buttons.

Best of all, Multiply sounds very musical! There are only 18 presets, but each is quite different, and together they show the wide range. Of course, you can create your own library. If you want to clearly hear the differences between the presets, try putting Multiply after a simple waveform source like a monosynth or solo guitar and click through them. It has a manual, with the gist in two pages.

I did not know about Acon until the KVR-DC, but they sell some quite sophisticated DSP and audio editing products, so definitely have chops and it shows in this plugin. And... Windows/Mac, VST/AU/AAS.

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Discussion: Active


24 August 2014 at 10:19amDamienStaab

This is magical plugin! I try it on piano, clean guitar and back vocals and it makes sound more density, especially on back vocals.

27 August 2014 at 7:11amstian

Thanks, I'm very glad to hear that.

27 August 2014 at 12:05amMichael L

Congratulations on the KVR-DC. Innovation and quality wins.

27 August 2014 at 7:11amstian

Thanks! :-)

28 August 2014 at 11:32amlayzer

love it! love it! thanks Acon!!!.

29 August 2014 at 11:37amstian

Very glad to hear that - thanks.

29 August 2014 at 2:38pmjam92189

I love this plugin on Vocals. used lightly and in mono they can thicken and fill out a vocal without making it seem like a effect. amazing really.

31 August 2014 at 7:26pmstian

Thanks! I think the ability to 'thicken' without perceiving it as chorus is one of the key strengths of Multiply and I'm glad you see (or should I say hear) it the same way.

5 September 2014 at 1:27amadriansymes

Congratulations for creating such a usable and useful plug. It does what I'm always trying to do to monophonic instruments. Can't wait to try it on my sax.

22 October 2014 at 9:51amstian

Thanks, I hope it sounded nice with your sax... :)

4 October 2014 at 8:23amkvrslut

This is obviously a gateway plugin! The chorus plugin is one of the best I have used and is a steal as a free plugin. Works amazingly on vocals and guitars without sounding like an obvious chorus effect. Very tweakable and nice interface.

22 October 2014 at 9:51amstian

Cool, thanks.

10 November 2014 at 6:48pmCharly Romero

Muchas Gracias!!! Ya lo usé en mis producciones.

10 November 2014 at 8:22pmstian

Gracias a ti, Charly! Me gusta escuchar que puedes usar Multiply en tus producciones.

14 November 2014 at 11:57amCJoe78

It detunes the sound extremely well. If you use it as a mixer send effekt with a little bit modulation, you can effect every software instrument to sound like "a real analog synth". I've never heard something like this.

20 November 2014 at 9:22amstian

Thanks! I think the phase randomization in Multiply is the reason why it sounds more 'analog' in this case... :-)

10 September 2015 at 6:02amdem76

very clean thx.

12 November 2016 at 6:06pmRoyster58

Hi Guys.

I am getting really bad CPU spikes with this plugin. I am gutted as it sounds really cool in all the demo's I have watched. I am using Win 10 64-bit with Presonus Studio One 3 Pro. This is not a problem I am used too so any suggestions would be appreciated. I would pay for this plugin as it sounds so sweet. If I could use it that is :p.

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Acon Digital Multiply

Average user rating of 4.33 from 3 reviews

Acon Digital
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