Hi James, great to hear you’re digging the new look site!
You should be able to attach a dynamic cable pretty easy with the new cloth dynamics tools (I usually avoid the rope tag because it can be a pain to stop it twisty weirdly).
If you make your cable a CYLINDER and wrap it along a spline with a SPLINE WRAP, you can use a cloth tag with SOFT BODY enabled so it keeps its shape (you might need to lower the bending too).
Then because the cable has a CLOTH TAG you can use a dynamic CONNECTOR to connect it to your guitar – the guitar will need a cloth tag too so they can connect – if you don’t want the guitar to deform like cloth set the MIX ANIMATION to 100% so it keeps its shape.
That’s the basics anyway, I think this one will make a good tutorial so I’ll try and put up a video soon.
If you need a hand going through these steps just reply here or hit me up on the live chat.