organdoc,

There is a deeper problem with the issue if people are not showing up to play, etc.

I'll reiterate the wrong and right definition of corporate worship that I learned probably 10 years ago:

Wrong:

God is the prompter
Musicians/worship team are the performers
Congregation is the audience

Right:
Musicians/worship team are the prompters
Congregation is the performer
God is the audience

If you can't get some folks to show up and take responsibility, it's time to go acapella. I'm serious about that. I attended a church several times when I was in college when the only non-vocal instrument in the whole place was a pitch-pipe.

That church knew how to sing. Shape-note hymnals and everything.

If that won't work, then it's time to hire out for at least a guitar player/worship leader or piano player. Even consider hiring some non-believers. There's a church back near my home in Michigan that had very 'skillfully' nailed, and they used some hired in musicians as a witnessing opportunity. They were treated with grace and you know what, those opportunities bore fruit more often than not.

-Scott