have a complaint that MOH is too loud. Is there a way to turn the volume down on it? Also, it is loaded in as a flash file on the router. Not sure if this limits my possibilities or? I supposed I could have the WAV file re-recorded at a lower output?
Unfortunately you will have to redo the audio file. Have a look;
The volume level of a MOH file cannot be adjusted through the Cisco IOS software, so it cannot be changed once the file is loaded into the flash memory of the router. To adjust the volume level of a MOH file, edit the file in an audio editor prior to downloading the file to router flash memory.
From this CME doc;
If it were loaded via CCM you could use this method;
Here is an excellent Cisco Tech Note, pay special attention to this excerpt;
"Changes to this parameter only affect audio files that are processed after the change occurs."
From this doc;
CallManager Music On Hold Volume Adjustment
Hope this helps! Sorry my friend :(