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.
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.
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.
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.
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.