i got the deep impact about 2 weeks and it worked fine for the first few days. ever since then, its been acting up to the point where i am ready to return it. sometimes it just dies out on me, and i thought it was because the input level was too high and it was overloading the unit or something like that, but i adjusted it and still had the same problem. other times, i change the preset effect and it stays on the effect that i had it on before i changed it. for example, i had it on effect 9 (hiccups), and turned the dial to 3 and it was the same effect. yes, i am sure i was changing preset and not attack . and still other times when i have the unit off (plugged in but not in effect), it totally sucks away the volume of my clean bass and i have to umplug it and plug it back in. anyone else experiencing a similar dilemma or is this definitely one to return?