Disklavier

Hopefully someone can give me an idea about this...

I have one of the very early Mark IV DC3's which I purchased in late September 2004. I have always loved the piano and never regret the purchase. 

As of late though, I seem to be having a volume problem. I do not seem to be able to raise the volume of the audio tracks behind the piano to a point that it is fully audible. I know this was a huge issues with the Mark Ii & III's, but I never recall there being such a problem with my piano over the past 8 years.  

I do know that I have an issue with the PRC battery needing to be replaced, but generally I have always found that item to be fairly useless because of it's short battery life on a charge, and the short distance it has to be from the piano itself. Now that iPod / iPad devices exist,  I use  my iPad with the Yamaha Disklavier app, or I utilize Kevin Goroway's interface DKVBrower V.1.8 on my MAC. 

The audio balances out when I play the piano in Quiet Mode, but that is not why I bought the Disklavier. I do have the Audio Volume turned up to 126. I have even gone in and attempted to set the Main Volume Adjust to -65% and the Audio Volume Adjust to +20%. It does no good. I have checked the volume control on the speakers themselves and they are turned up as high as they will go. I have shut the piano down and rebooted freshly. I'm kind of out of ideas. The issue exists no matter which album I play. 

Any help would be appreciated. I don't think so, but would a working PRC resolve the issue any differently than the iPad app? 

Thanks in advance for your help. 

Glenn Smutny 
G.SMUTNY@...