Yamaha SPX90 Operating Manual page 23

RECORDING SYSTEM
In a recording system it is most desirable to have the SPX90 input and outputs available at a patch bay where they may accessed and patched
into virtually any part of the system. In some cases it might be best to have the SPX90 connected directly in line between the source and the
mixing console inputs, while in other situations—final mixdown, for example—the SPX90 should be patched into the mixing console's effects
loop so it may be applied to the entire mix. Naturally, the SPX90 is also an ideal choice for the truly modern digital sequencer recording system, too.
(SYSTEM DIAGRAM 3)
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