This page will be very short. The reason is that we’ve already done more than 90% of the work required to make a trumpet. The reason is that a trumpet is nothing more than a baritone that’s tuned exactly one octave higher.
Converting a baritone to a trumpet requires only these steps:
A sample patch is here.
A French horn has four valves, not three. It can be modeled by extending the techniques we’ve already used, but we’ll not bother. We’ll just make a reasonable-sounding French horn by adjusting the final EQ.