No sound after buying /adding instrument to notation

[ToPhatTPatt]

Hello hopefully I can get some help here. I just bought a couple of instruments (flute section & flute duo). I added the flute section to some music I already had written for one flute, just messing around seeing what I could do. Now I have no sound for that piece. I have tried removing all instruments and putting only one flute back in, I have reset the I-pad, nothing so far has made the sound come back. The other music I have still plays its just the one I tried to use my new instruments on Silly me for trying to use my new instruments!