I'm kind of in the same position with my involvement in the choir at church. The Worship Team isn't a traditional choir, it's kind of the church's Garage Band, doing the music for the Contemporary service.
Through a string of events that are MUCH too long to bore folks with here, I've gotten stuck running the PowerPoint system that projects the song lyrics on the wall, EVERY WEEK. The rest of the group seems to have forgotten that I also play the guitar, not to mention singing, and I've been working for half a week now on a protest letter to remind them of this, trying not to sound like a diva throwing a hissy fit.