I am building a small scale studio in the near future. i will be building the stud framing out of 2" x 6"'s to add a bit more space for insulation to dampen the audio from both the inside and out. I am debating if I should use R-19 or R-24 fiberglass insulation for the in wall insulation. I would have gone with spray in, but it doesn't last that well over the long run. The building total will be 12' x 14' so space is really limited... I just figured that since I wanted to try for the best insulation from noise and heat transferI should go with the extra 2". What do y'all recommend?