Studio Setup, page 5...
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Connection Scheme 5:
In Figure 5 below, we add a MIDI expander module. A MIDI expander module is basically the same as the electrical circuits of a MIDI keyboard but without the keyboard. The main function of the MIDI expander module is to provide additional sequencer-controlled voices/instruments for the song. The expander modules usually cost less than their keyboard cousins, plus they can be mounted in a rack. The main advantage of adding expander modules to a sequenced MIDI set up is that more voices go to tape in the first generation, rather than adding noise with the additional tape bounces and overdubs described previously.
I have shown the MIDI connections from the sequencer MIDI Out to the synthesizer, expander module and drum machine as a series of daisy-chained connections using the various MIDI Thru ports. This approach will work. A better approach that avoids accumulating lag times is to use a 1-In/4-Out MIDI Multiplexer box. These cheap little MIDI processors can take 1 MIDI input signal and replicate it into 4 separate MIDI outputs.
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