My zune 30 sounds like the vocals are using an echo or reverb fx through ear buds - it is VERY annoying.  It sounds fine when the zune is hooked to my stereo (??!!). 

I have tried all file types and bit rates has no effect.  

I have tried 7 different ear pieces ranging from $9 - $100.

I have loaded the new firmware twice.  

I have reset the machine dozens if times. 

I have tried various eq settings with the same results.

The radio sounds GREAT with all earbuds (??!!).

THe video sounds TERRIBLE - like the music.

If it is insturmental it sounds good - that makes me think it is a DSP issue.  

In all cases it sounds great through the stereo - that makes my think it is an output impedance issue (I find that hard to believe especially when the radio sounds fine.)

OK - suggestions???