No review for this very good synth which is moreover free? Well, though I'm not very good at reviews I'll try to make one.
The Unknown Synth is probably the best sounding synth from Odo, and that's not saying little. The synth has two main oscillators and two other oscillators for phase modulation. You can achieve great sounds from this. The sounds are fat and perfect for leads and pads and basses, but basically for long strong sounds.
Then there are two filters which are actually not amazing but they do the job perfectly. They have adsr envelope. But the real gem of this synth is the arpeggiator. Perfect for trance melodies, when you'll listen to the sounds you can make from this another synth will come tou your mind. It starts with V. Unknown doesn't sound as good as this other synth but almost, but that's mostly because of the onboard effects of the latter. When you pass Unknown through a good chorus or a good reverb, you'll be amazed of the results.
But it's not only good for techno or trance. It's perfect for more industrial sounds, which is what i use it for. Add to it some distortion and you'll know what I mean.
The user interface is easy on the eye and the knobs are big. It aslso reminds that other synth...
There are not many presets, and those present are just ok. This synth would deserve a good bank or more of presets by good programmers.
Value for money: well, it's free!
Stability: it has never crashed on my host, Fl Studio. Never.
Its developer is also very accessible and always eager to improve his products, and that's something one cannot fail to appreciate.
All in all, though this synth is not the best sounding free synth available, it's definitely one of the best, and it's a bit underestimated I would say. Download it, you won't regret it.