shivermetimbers wrote:So even though I have the LFE working, that does not mean that I can route my acoustic guitar signal to the LFE, right?
You can route anything you want to anywhere. But if the acoustic guitar was recorded in 5.1 Surround, and there's nothing at all in the LFE channel of the 5.1 audio file, it's not typical to route it to the LFE, which is why the Surround panner doesn't let you do that. That's the case in this thread's example.
Think of stereo if that's easier for you: if you take a stereo file that doesn't have any audio on the left, the balance control does not let you route some of the right signal onto the left of whatever stereo out that channel strip is routed to. But if you take a mono file you can route it to the left, to the right, to the center, or anywhere in between.