China Grove

For more than a year now, the song China Grove has not played correctly on my Chordify program. It starts out very faintly sounding then gets the right volume and then gets faint again, then gets to the right volume again. I have tried numerous different versions of the Doobie Brothers version of this and they all do the same thing on Chordify. But when I just play it on You Tube it sounds correct, so I'm thinking the bug is somewhere in Cordify.

Any suggestions would be appreciated,

Thanks in advance,

hb