I use an acoustic on all my recordings. Mostly it's my Yamaha LS16 into a Rode NT1A, sometimes it's from NI's Strummed Acoustic library. In every case I have to decide to double or not to double. A lot of times this is a difficult decision to make - here are the major factors: 1. If it's a picked part with little bass, I will usually double - either with a second track or using the Waves Doubler plugin with asymmetric panning. 2. If it's a strummed part, again with little bass - then I'll double it. The guitar is being used here as a pad. 3. If it's a part with a strong rhythm, with a lot of bass - then I won't double, just pan slightly off centre. The rule here being, that I don't want anything sub 200hz hard panned. How do you approach this? When will you definitely NOT double and why?