As someone above mentioned, an "undo" function is necessary for a synth like this. I've been working with it a lot for the past few weeks (I absolutely love this synth) and I have noticed that small tweeks have a huge affect on the sound, and sometimes I want to get back to where I was before the tweeks and to do that I often waste a lot of time. So undo would be greatly appreciated! BTW, best soft-synth in 2016 for sure!