In brief, foldback is the term used to describe the way of sending a copy of the input signal back out to headphones in the liveroom so that someone playing an instrument can hear, for example, a metronome on a channel.
To get foldback to work you have to send a copy of a channel, for example channel 1, through auxiliary 1. Then on the patch bay you should route aux 1 through to one of the 4 headphone outputs. This will be sent through to the liveroom stage box. From there you connect headphones to hear channel 1. If you wanted a metronome to be sent through you would play a metronome on the mac/pc that is routed into two channels on your mixing desk. Then you would route these channels into aux 1 and the metronome will go through.
DI stands for direct input. This is a device that limits high electrical impedances in the input signal so that it does not damage the mixing desk and other connected devices.
Setting up a direct input is relatively easy. You connect a microphone/electrical instrument to a DI box and this is then connected to the stage box.
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