I do not own the DTX900 module but this is what the owners manual says...
INDIVIDUAL OUTPUT 1 – 6 jacks
Line level audio signals are output from this instrument via
these phone jacks (1/4" mono phone plug). These outputs are
independent of the main output (at the L/MONO and R jacks),
and can be freely assigned to any Drum Voice. This lets you
route specific sounds for processing with a favorite outboard
effect unit.
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