This interactive tone finder is a really cool tool where you can adjust the setup and knobs on effects pedals to hear what they really sound like. It's really cool if you don't get a chance to try out all the gear in a store and you can select the guitar and amp too - and the style of loop that plays to test the effects!
Just select the guitar, effects (use the + on the lower right corner of the pedal area to add pedals!) and amp and get twiddling the knobs to hear then change the tone in real time! Change the loop in the bottom centre - but it's not always there... if it's not, click on a pedal and it'll usually show up!
It's best used with Google Chrome browser and use headphones for the full experience! Hope you dig it!