Instrument Sound Clip Libraries

Hello all,

I'm interested in internalizing the different tone colors and effects different instruments have (mutes, special bowing techniques, extended techniques, etc.). Does anyone know of an online database which has recorded samples of each instrument with different effects?

For example, I'm looking for a site that could provide audio of a Horn in F playing muted (non-transposing), stopped, muted (transposing), and open. 

This would be as a substitute to someone who didn't have access to live players who could demonstrate these effects in person.

Many thanks.