I was asked to stay after and record acoustic guitar for a project that Neil himself is playing on. Neil picked out a microphone that he has had success with and I set it up/placed it while he practiced. I had him get comfortable in the chair and I aimed the mic where the neck meets the body of the guitar to get an overall balance of the guitar tone. It sounded great on first listen surprisingly and was the warm and full sound that the track needed. This felt like luck, but I did put some thought in when I positioned the mic, so I felt like it was a success.
Neil was extremely happy with the sound and asked me to come back later that week to track some guitar tracks for his next album. I had the idea to use a stereo XY technique this time and placed in the same position as the first session with a third microphone as a room mic. Unfortunately, this sounded thin compared to the sound we were able to get in the previous session. After messing with all variables(mic placement, preamp setting, compression, etc), Neil and I decided to switch back to the original setup with the one mic and try to get back to the full sound. After we set it up the original way, we were not able to reproduce the sound tone. I again messed with all the variables and after about two hours we chalked up the whole night as necessary experimentation.
After some discussion, it was decided that there were two things contributing to the lackluster tone. The first factor was the difference between the actual guitar parts being played. The first night, we recorded with a capo and Neil was finger picking. The second night, we were recording strummed open chords that were much louder and less controlled. The second factor was the physical design of the guitar that had sound holes like (the side hole on) this and (the top hole on) this, which I thought was contributing to the uneven tone.
Neil said we’ll try agin soon with a different guitar. I’m in.