I have a Shure SM57 which I was going to use to record some guitar from my 2x12 cab. I am going to purchase an Apogee duet which has two channels and would allow me to run a second mic simultaneously. I was wondering if it's worth recording with a second mic to the SM57 to get a bigger sound? If so can you please recommend a mic? Are you better to mic the cab using a different mic to the 57 or use the second mic to record a bit further back in the room? What mics are good for room ambience? I guess it is worth noting that the "recording room" is the spare bedroom in my 3 bedroom unit. It's an old unit with neighbors above and beside us so I won't be able to turn the amp up very loud. I would also be interested to hear from those with experience if you can get a good mic sound even if you speakers aren't pushing much air?