I am completely new to electric guitars so bare withe me.  I have the spider IV 15.  It comes with the 4 preset models.  I have been playing with each to find some sounds that i like.  My question is what is the difference between the models?  is there a difference, or, with the right setting on the tone controls and the FX controls can i make, for instance, insane sound the same as clean?  Also i see all the different tone and FX setting at custom tones but what are the setting for the factory programmed models?