Once in a while I use an stomp box on a gig. Should I run the output to the passive or active input on the amp? It's a Carvin R600. I've used both without problems, but don't want to run into trouble either. BTW, I'm using a Carvin LB20 (active) and a Zoom B1U box. Logic would tell me to use the active input since the box is powered, but again, most amps don't have the option so I assume they are in what would be considered the passive mode. Thanks!