Add Euphonium/Baritone Horn

How is it that an instrument this common in marching bands, wind ensembles, brass bands, and orchestras has no sound in MuseSounds? We have a cimbasso (which is wonderful), but not an arguably more scored-for instrument? I know I should not look a gift horse in the mouth, but it's honestly really disappointing. Using a tuba sound does not work as the range caps out midway through the tesssitura of the euphonium.