OK say you have a patch that has in Scene 1 a Clean sound. kinda a Country Spank sound. You use that for a song or two and you need a lead boost. You can use a Control switch to add a delay and an EQ boost for your Lead and assign them to switch 4 on the bottom row. So that's yous control switch. It's set up with a Lead Delay and an EQ to boost the db and give you a mid boost to cut through the mix on your leads.
Now lets say on that same patch, scene 2 might be a slightly over driven sound. You may want to have a lead section while using that scene. You would use your Control switch. Now let's say you're on scene 3 which is a really over driven high gain sound and you want a lead boost for that scene, you would use your Control switch. That's how I have my patches set up. That way I can play almost an entire set with just 1 patch. The switching is seamless and I have everything I need. 3 different sounds all with a lead boost that can be activated at any time.
That's just the bottom row. The top row 4 switches I use for effects toggle on and off. Like a Chorus, and extra drive pedal if I need, a Phaser and an extra delay for some spacial passages. I don't know if that makes any sense to you guys but it makes perfect sense to me. I only use about 2 or 3 patches for an entire 3 hour show this way. It's alot easier to dial them in too instead of using a different patch for every song. I know everybody has their own way of doing things but you asked so there ya go.