MoH Stream Soft volume

When we use uploaded wavs, freepbx converts them fine, it plays loud, as loud as the tracks are normally, all good.

But using the custom streaming, its about 1/4 the volume, very soft, it uses icecast2/ezstream on the same machine, if we goto icecast on the pbx:8000/stream its loud, as it should be, so something inside freepbx is reducing this volume.

Does anyone know what this configuration option is, its obviously not a freepbx setting, but one of these thingd we need to fix under the hood in its scripting?