I want to know the answer to the following question:
What is the name of the modified member of the horn family appearing in several works by Strauss?
All the background I'm provided with is that "Unless these instruments are played by members doubling on another instrument (for example, a trombone player changing to euphonium for a certain passage), orchestras will use freelance musicians to augment their regular rosters.". Is that enough to answer the question?