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I bought this unit for 200 SEK, which is around 20 USD or so. Like mentioned before, this thing is weird. The sound quality is a bit grungy as well. Audible aliasing noise isn't uncommon from this module. Think of it as a sort of early digital modular synthesizer, like Clavia's Nord Modular synths, except it has no filters. It's also 8 part multitimbral and has 16 note polyphony. With only a left and right output however, the multitimbrality is not as useful as it could've been.
It has 4 6-stage envelopes and 2 LFOs which can be freely routed to control almost any parameter of the synth engine including the LFOs and envelopes themselves. The fundamental part of this synth is the 28 synthesis algorithms. This allows the EVS-1 to do 4-operator FM, 4-operator Phase Distortion (presumably modeled after Casio's CZ synths), wavetable synthesis (like the PPG Wave, except much more limited and no filters), and various other algorithms combining the already mentioned algorithms and adding waveshapers and feedback and other madness.
The user interface isn't very good and you NEED a software editor to program this synth. Then again, the same goes for Clavia's Nord Modular synthesizers. Sound Quest MIDI Quest does the job moderately well, with a few hickups now and then. I haven't figured out if the problem lies with MIDI Quest or the EVS-1, but i'd put my bets on the EVS-1 glitching a bit. It will sometimes crash and do other unpredictable things when you least expect it. Not the most reliable synthesizer i've used. The build quality is also questionable even though it seems robust at first glance.
The presets are a mixed bag. While they probably didn't impress anyone 15 years ago, these days they may just be what a lot of people are looking for. You won't get realistic pianos or fat analogue squelching out of this synthesizer but if you're looking for sparkling digital FM-esque drones with varying degrees of weirdness and fm bass sounds this unit won't disappoint. The sampled drum kit, like the previous reviewer mentioned, is also extremely weird. It seems to be laid out pretty much at random, with duplicate and re-pitched versions of the samples all over. The drums aren't bad really, but it feels like they don't know what they're supposed to be used for.
Evolution has basically forgotten about this old unit, but the nice support people managed to find and email me a PDF of the manual anyway. They weren't able to locate an image of the original Atari editor though. The manual isn't terribly good but it should be considered essential for learning how to use and program this thing.
To sum it all up, i personally love this unit. It's a diamond in the rough, and i'd like to give this synth the highest possible score for being innovative and unique. If it wasn't for this however, it would be considered just plain bad. The EVS-1 is not the synthesizer to end all synthesizers and you'll need other synths besides this one in your setup. Like many similar digital synthesizers, you'll also need to add a bit of reverb to stop this unit from sounding too sterile.
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