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Grey Matter E! Upgrade (a rare $399 expansion card)
What, you may ask, can $399 get you for your shiny black FM machine? Would you believe eight-voice polytimbral capability? Would you believe a four-layer performance mode? Would you believe one-key control of arpeggios, ostinato patterns, and multi-timbral chords? Would you believe a 16-track sequencer? \
Engine is E's 16-channel event processor and operating system, which controls all of the DX's MIDI and performance functions. Its capabilities include storage of 256 patches and 128 performances, 16-channel MIDI mapping, and two auto-accompaniment modes. To top it off, you can store any setup (auto-accompaniment, MIDI maps, sequences) as a Performance, so a single DX button can be programmed to load everything you need. It will even load a file on the DX7IIFID's disk automatically. The other main modules in E! are Octal and SE!quencer."
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