Generate Sustained Trumpet Tone

[Trebor]

Is there a tool in the Audacity toolkit that will allow me to generate a track where the waveform sounds like a sustained trumpet note

Could find a trumpet sample and stretch it …

Alternatively, is there a menu item I’ve overlooked that will allow me to select a sine tone and transform it into a reasonable facsimile of a trumpet tone?

Trumpet waveform is WAY more complicated than a sine wave.
There may be a formula to synthesise a trumpet waveform, (but I don’t know what it is).