Hi all, Can someone help with this?

I am using a pic16f819 and trying to use the DTMF out to generate tones. This is not for a sound application but just to make touch tone type sounds. Now the problem is... it sounds like garbage... does not even remotly resemble DTMF. I need it to sound like it would if you were dialing a phone. Any thoughts? I even tried the filtering schematic in the manual and no luck there. tried clocking the pic at 20 and still no luck. Im trying to avoid using the touch tone generator chip if at all possible... any help is appreciated!