Asterisk MOH Volume on FreeBSD

Hi,

I am running Asterisk 1.8.12.0 on FreeBSD 8.1.

I have a problem with the MOH volume being too loud and thus distorted. We have tried sox, etc. but to no avail. The box seems to upscale whatever the volume is and makes it louder.

Does anybody have some ideas or maybe a similar problem?

Thanks