I bought a bass trombone for $475 on eBay last March. Its not the greatest horn in the world, but its good for a starter, like myself. When I got it, the second trigger didn't work, but I got it fixed and figured out it was a Bb/F/Eb horn. The triggers are dependent so both triggers need to be pressed to get the Eb. I've looked on the internet and asked my music teachers, but I can't find any charts for the Eb trigger. Can anyone help me?