I think the sound slightly varies from pedal to pedal, because I got two friend who have ZooM 505s, & they both set A1 exactly like my A1 trying to get the same sound as me. But even if we try them all on the same guitar & amp we get different sounds. I mean, they all sound good, but different. I can probably help you out...but what kind of effects are you having the problem with (distortion, clean, reverb, etc.)? If it's on all of them, it could just be the settings on your amp. Keep in mind, the same settings on your amp are most likely built into the ZooM. I hope this helps. good luck.

"I can probably help you out...but what kind of effects are you having the problem with (distortion, clean, reverb, etc.)? "