Disklavier

Help please: 
I've got a type 0 standard midi file from another source that was
recorded using Acoustic Grand Piano voice on channel 1 (this was the
specified format).

I put it on floppy and tried playing it on the Disklavier.  It played
but only using the Tone Generator, i.e. the piano sound came through
the speakers, but did not play on the actual piano strings.

How do I get this to play on the strings?

Thanks