Acoustic volume on my Mouse is about the same as a regular solid body. I had an RT Ren 5 which was somewhat louder, due to being fully hollow. My old Hofner Senator, also fully hollow, was a little bit louder than the Ren. Strings also make a difference, LaBella nylons are pretty quiet acoustically for example. If your practicing to a backing track of some sort, even at very low volume all of these would really need some sort of amplification.