I just got hold of a used sansamp bass DI and it sounds terrific. Thing is I would like to know how I can use it other than as a stomp box. I would like to know the right way of connecting it to my hartke head in order to use the sansamp strictly as a preamp. that is, the hartke's preamp is bypassed. would plugging the output of the sansamp into the "return post" be the solution? there are other jacks at the back labelled "send pre, send post". and "return pre, return post" Hope someone can shed some light on this!