I didn’t test Daniel’s file, but there was a change in how these worked between D4 and D5. In any case, I made a new doricolib file and posted it in this thread. That one should work in D5 and will add the instrument in a Custom category, although typing 0 in the instrument selector should bring it right up. You can obviously edit the staff label either in Setup or in the doricolib file to have it be whatever you want.