Fostex FD-8 Quick Operation Manual page 23

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After overdubbing and ping-pong recording, you can mix all track data into two channel stereo and record
it onto your master recorder. This final process of multitrack recording is called "mixdown." You can apply
effects, such as reverb, to any track data during the mixdown.
Connecting external devices (master recorder/reverb effect unit)
1. Connect the input jacks of the master recorder (DAT or analog recorder) to the STEREO OUT L/R jacks
of the FD-8.