Simply plug The Volume Box into the effect loop on your amp using standard instrument cables (thats the preamp out and power amp in jacks, you need a series effects loop for this device, it does not go between amp and speaker) and turn the amp UP and then adjust the overall volume with the volume box...this allows you to get more of that wide open tone at nice safe levels, it really works great! Works on ALL amps with a standard (series) effects loop! A must have secret weapon every guitarist should have in their trick bag! Works great live, at home, in the studio, wherever! This box is made of durable molded plastic, all quality components, very well made and yes you CAN still use your effects loop for other devices while using the Volume Box, just be sure to place the Volume Box last in the loop and everything will work just fine! Box is very simple to use, no batteries to change or anything like that, just plug and play!!! This is the best bang for the buck you will ever get for your amp! Cables not included, and standard instrument (not speaker) cables will work fine, full moneyback satisfaction guarantee of course, thank you and be well! -Carl