apparently it's written sequencer and arpegiator on the pro one, though it's not a sequencer like cubase, more like an arpegiator. But sometimes it's called differently, and in the end i called it a sequencer cause it's working on a sequence anyway. when transposing, it's becoming an arpegio being played;
there's a little board, modern, that exists to replace one rare 8021 chip from the pro one, responsible of the sequencer/arpegiator, but it doesn't feature the midi unfortunately, or i'd have bought it.