Low volume on recorded messages?

Every time I record something (be it for an IVR menu, or just testing), the playback of the file is so low that it’s almost impossible to hear. I’ve tested different microphones, different soft and hard phones, and different settings for mic input, all of which leaves me with the same problem.

Is there a setting in Asterisk that I’m missing to amplify playback of recorded files? The normal playback files (weasels, not available, etc) playback fine.