Since it was aired in 80s they used AKAI and E-MU samplers, I think the confusion comes due to used chords and it does sound artificial in those...
It is just a random filter movements similar to Massives LFO pattern with a reverb and short delay effects layered with some weird lowpitched...
Its not a stab its future bass chord saw through filter LFO, done in a two seconds if you know chord progression
Whats make you think its a synth trumpet? It sound like a real trumpet layered with a sawtooth.
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