Very sentimental for me. My first sequencer (on DOS!) was Sequencer Plus from Octave Plateau, back in the 80s. You put your 5.25 floppy disc in your computer to load the software into memory, took it out and put another disc in to save your files. It made no sounds, just pure MIDI to play your synths and modules.
Anyway, Octave Plateau made this synth, which was way outside my price range. I've never actually heard it. I would be interested in this if I hadn't already spent my money.