A good way to work with just two footswitches, is to work in banks of 3, with the 2nd patch always the same. So, if you have a main sound (could just be clean), get that right, then copy this to every other patch on your zoom, and fill in the gaps with the other patches you create. This means that you should always be able to switch to and from your clean sound, and should mean that 90% of the time, you can set yourself up to switch to any sound. If I have two sounds that I need to switch between without going to clean first, I will program this, but that's specific to individual songs/players.