I’ll chime in with my poor excuse for experience here. I have an AC15, and love it. I also have a MoJoMojo and live it, but not with P90’s. P90’s and that pedal are both mid heavy, and a Vox has plenty of mids. A combination of those 3 doesn’t make for the best tone. (Too farty) Next, what P90’s do you have? Is it one of those with the ceramic bar magnets? If so, I’ve found those a little harder to dial in. They’re typically much hotter than your “average P90”. Not that they’re bad, just harder to give advice on what settings to try. When using my Vox with P90’s, I like to use an OCD type pedal. You can get different levels of distortion from it. Mine is actually set to a crunch level, nothing heavy. I use the guitar volume for the clean/jangly stuff, the OCD type for the crunch, and, believe it or not, a Muff for the harder drive. Mine has the sustain down around 8-9:00, as I’m not going for an insane level of fuzz. A Rat might work for you too. If you can go to a store and sit down with your guitar, an AC15, and test drive some pedals, you’ll find what you’re after. The Vox has it, and can cover a ton of territory. One more pedal I’m pretty fond of; the Wampler PlexiDrive. It’s a MIAB, but it does everything it does very well with an AC15. And hang onto that MoJoMojo. I’ve found it to be great with my Strats!