It’s obvious to me that John is not only an amazing engineer but also an awesome bass enthusiast. The J Tone, like all of his products has been created from a bassists view point. It’s a musical product that allows the bassist to get the exact sounds that he/she needs from the instrument (quickly and easily). IMO if you want to give your bass a STEROID type boost, stick one of these ‘bad boys’ in. You won’t be disappointed ……… Forgot to mention it sounds fab in passive too.