Questions about voices

[IceTre]

Please forgive me, I'm still a beginner when it comes to synthesizers.  I have a question about voices.  I'm hoping someone can educate me.

When you press a key, then a voice is played, right?  If you play a triad, then 3 voices are played, and so forth, right?

If the sound has a release time, then voices sustain pass the release of the key, so you need more voices than the keys depressed in order to hear the new voices, or else there is "voice stealing", right?

One voice could be two (or more) oscillators, combined, right?

I have heard of combining two (or more) voices into one key press.  But the combined voices use the same oscillator and filter settings, right?  Or is there a way to have, say, a third or fourth oscillator, with different settings, all on one voice?

Sorry if these sound like beginner questions, but they are from a beginner!

[g3o2]

While the signal generation chain settings are the same for each voice, on synths using analog components at least, the sound of each voice will be slightly different for each voice because anything that oscillates (including LFO) will do so continuously and indifferently from you pressing a key.