I have only recently bought the amp. Although it was second hand it had hardly been used. The amp of a 120 watt spider IV series. I was using the killswitch engage setting when i lost the distortion. I have messed about with the amp and managed to get it back but then i turned amp of and came back to it and now cant get it back. i have been using other presets and still the problem occurs. I just assumed that maybe it was the lead i was using as it needed repairing and wasnt letting all the sound through it, but i have since used a different lead and the amp still doesn't have any distortion. Can someone help me please? Has this been a problem with other people?