Speck Electronics Xtramix - Manual (Page 45)

17. Program Feed Jacks
Each of the left and right program insert jacks employ a T.R.S. (tip, ring,
sleeve) type jack. The ring of the 1/4" jack is the unbalanced insert send
(pre the Program Master Level Control), the tip is the unbalanced insert
return, and the sleeve is the signal ground.
Any stereo 1/4" plug interfaced to this jack should be wired accordingly.
(See figure 11b)
These balanced 1/4" TRS phone type connectors are the left/right
outputs for the stereo program master. The signal present at these jacks
is adjusted by the Program Master Control on the front panel.
The left and right program feed is capable of driving up to three high
impedance bridging inputs simultaneously. The Program Feed Jacks
are available for interface to the input of an external console, stereo tape
recorder, etc.
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Fig 11b "Y" Cable schematic
Fig 11a "Y" Cable
Chapter 4 Operation Section