Hmmm not sure NINJAM will work for us as it looks like you have to upload a track and do quite a lot of set up. Others in the group are not at all techy and we had trouble all connecting to Zoom - in the end I had to set up a Skype session and walk them through !!! At the moment we are experimenting with the melody line singer singing live and we sing our parts against it with the mic muted - not ideal but we could then reord our versions and share. At least it is some practice