Keeping singers in rotation

[batman0001]

Hi there I used to use 0000 in the song number and add singers name to keep them in the rotation when they haven't put their next song in yet. But in Hoster 4.01 you can't use 0000 as a song number. How do you keep singers in the rotation (when entering songs ahead) when they haven't put a song in.

Also for my last 2 shows I have plugged in my external hard drive (to the same usb port that I use all the time) and it has given it a different drive path and I have had to rebuild the song database to recognise the new drive, before I start the show. Any suggestions why this happens?