Summary: This is one of the best sounding synths around. Even without effects, it sounds great. And, its CPU load is less than most. It is a bit lite on options, but that is easily overlooked.
Interface: The interface is cleanly designed; however, it takes a while to get used to the rocker switches. It is not obvious at first which position is 'on' and which is 'off'. Small nit, though.
Sound: This is what it is all about. I cannot say that ive heard a synth that can better Asynths raw sound. (And since there are no onboard effects, that is all you get).
Features: Here, the synth falls a bit short of its potential. This year, what moves me is sound quality and 'elegant simplicity'. Features, in and of themselves, are beginning to annoy -- especially when it gets to multiple redundant copies of modules and the like. But simplicity does have its limits. Asynth only has the one LFO as a modulation source. In this case, I wish for more: any of ring modulation, hard sync, FM, pitch would be nice additions.
Documentation: The included docs are fine. Really, there is not much to document.
Presets: The included presets are excellent. Especially, the first 32 or so. In spite of the lean control set, there is a surprizing variety to the sound pallet.
Support: Antti provides a contact email; but to be honest, Ive had no need to use it.
Value: Excellent. It is donationware; so we determine this ourselves through our donation choice.
