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A headphone output will almost certainly produce too much voltage for a microphone input to handle - and you will get a highly distorted end result. You may be able to control it by hugely reducing volume, but mt expectations of the outcome of such an approach would be very low - poor quality sound and/or high levels of background noise, etc.
Ideally you would be looking for (what are called) "line level" ins and outs. These are most often seen as a pair of RCA sockets. But without knowing more about the exact equipment it's hard to be specific. Box 1 (playback) Line out to Box 2 (record) Line in....... |
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