To answer some questions:
The cable is xlr to xlr, I have another which I tried with the same results.
There is control software with the 3rd gen Focusrite but doesn’t have any options to tweak the gain, just an onscreen method of pushing the buttons really.
I’m not under the “Inst” setting and I’ve tried both xlr channels with the same result.
I am positioning the mic in front of the guitar but pointing at the 12th fret and about 12 inches from the instrument which is recommended on lots of youtube stuff, this only results in about 10% signal though. I mentioned having it right up against the sound hole because then I can get it up to about 50% with heavy chord playing but this is with everything turned up to max. I wouldn’t use that position to record it’s just the only place that the guitar actually gets picked up!
Been trying again this morning and I just can’t get any volume out of it, even with full gain on the focusrite and blasting the guitar straight at the mic.
I’ve recorded a real Bass guitar and a couple of channels of electric guitar in this same project with no problems and everything is playing back fine so I don’t think it’s a mixer balance issue or anything like that.
Anyway, I appreciate all the help, the new mic should be here tomorrow so I’m going to stop bashing my head (and your heads!) on the wall and wait for that. If it’s exactly the same result then I have to start tearing things down but I’m a bit suspicious of this Shure mic, knowing me I’ve probably plugged it into a lawnmower or something and broken it! I know I’ve used it before but cant recall the results, perhaps I tried to put phantom power through it and fried it.
I’ll update when the Rode arrives, if it gives me the same issues then I’ll probably take up stamp collecting.
Thanks for everyone’s time.