Thowing in some thoughts from a classical musician:
In an orchestra instruments can be polyphonic, paraphonic or monophonic. These terms are rarely used in this context but if it helps to sort it out:
Monophonic: all wind instruments. You can play only one note at a time on a french horn, trumpet, basson, flute etc.
Paraphonic: some instruments allow to play different notes at at time. The violin has four strings, but usually they play only one note at a time. If multiple notes are played (which happens often in orchestral music) the tone can´t be articulated independently. You have only one bow to pull over the strings.
The Accordeon is another example for a typical paraphonic instrument. The articulation is set by the player who moves the wind bag, all played notes behave the same way.
Truly polyphnonic instruments are the grand piano or all mallett instruments (vibraphone, marimbaphone). A church organ looks polyphonic at the first glance but is also paraphonic if you take a closer look. Notes can´t be articulated at all as you don´t have envelopes or velocity to use some synth-terms.