Alesis Studio 24 Reference Manual page 57

Recording
machine tracks you wish to record on into the record-ready or "input" mode,
and raise the MON 1/2 LEVEL control knobs of the Channels the tracks' outputs
are connected to. Set the CONTROL ROOM SOURCE switch to MON 1/2 (all
other CONTROL ROOM switches must be up). Set the Monitor PAN controls to
hard left and right to hear the proper stereo image in the control room.
If you don't perform this last step, the main PAN settings you make on the
channels you're recording in step 3 will be incorrect in the final stereo image.
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Be sure the L/R buttons are in the "Off" position (up) for the
Channels being recorded. Otherwise, this may cause the monitoring
to be false if the signals can be heard from two sources: the
Channels and the Tape Monitors.
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TUDIO EFERENCE
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ANUAL