I've recorded Roland e drums onto garageband using 9 individual tracks. i now want to transfer these individual tracks to my producer. I have tried Share/export song to disc, named each track and saved as wave file to garageband, but they appear grey

Hi, I've recorded Roland edrums onto garageband (on iMac) using 9 individual tracks. i now want to transfer these tracks to my producer so that he can integrate them into his master song. i've used 'share/export song to disc', chosen wave files, and done this for each instrument track (bd, snare, hit etc). i've given each track a specific name. Now I can see these named tracks in the GarageBand files but they are all greyed out. Why? what have I done wrong? BTW I notice that on 'export song to disc', nothing comes up to say where the tracks are to be saved. Thanks all!