I may have hinted at this question in an earlier post, if so I appologize. I still haven't found a good answer so I am gonna throw this out there. I actually have two questions. #1. I am currently using the following setup with both active and passive basses. SansAmp DI pedal into the front input of a Line 6 Bass POD Pro. From there I go out into a BBE 362 and then into the front input on a Hartke 7000 head. The head runs into a Goliath 4x10 and Big Bertha 2x15 respectively. My problem is, I am getting really nasty hum. Part of it is probably my cables, which I will be changing out very soon. The other, I think, is from NOT using the effects loop on the Hartke head and basically using the Bass POD Pro and BBE as glorified "pedals" in the configuration I have. Is it better to use the effects loop on all of these units as opposed to the way I currently am using them? I am wanting to plug the SansAmp into the Hartke head and have the POD and BBE simply in the loop of the Hartke. I also am at kinda a loss at how to do this with regard to the POD. It has numerous outputs on the back i.e., "POST" effects send/return and "PRE" effects send/return. It also has what's called a model out and so on. I am thinking.....(bear with me) that I should go: *Hartke send into POD post return- *POD post send into BBE in- *BBE out into Hartke return- Going into the post effects on the POD will allow the effects to be used in the overall sound going into the Hartke. This way I could simply plug whichever bass I am using into the SansAmp, run that into the input on the head, and adjust the POD in the loop of the Hartke. Thoughts????? #2 I am using basic instrument cables to run everything. This includes all of the connections in the back of the rack. Someone suggested I use TRS connections for all of the rack related items due to the fact that they are grounded cables. This makes sense to me and also may alleviate the hum I am hearing. Question is....when/where is it suggested to use/not use TRS cables in a rig? Should these also be used in pedal applications and/or instrument connections? Sorry for being so long winded and again, thanks for any info/suggestions you might have for me on this present dilemma.