ART Pro Audio HeadAMP 4 Pro - Five Channel Headphone Amplifier with Talkback - Manual (Page 16)

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Instruction
Individual instruments are patched in through the Aux inputs. They can then be monitored and
you can provide individual feedback using the talkback function available on each output. Using
the talk all function, you can address the entire group.
Using multiple HeadAmp 4 Pro's, you can have each student use one unit as a mixer with up to
four inputs. The student uses the Listen output for his headphones. Each student unit's Main
Input is connected to the teacher's unit. This patching also provides a talkback path.