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Output section (top) offers two 1/8" mono inputs and an attenuated 1/4" mono output thaat can be used as a line out for connecting with effect untis, mixing consoles or PAs.
Input section (bottom) has a 1/4" mono input, a level control and a switch for selecting amplification of the audio signal by the factor 10 or 100. The adjusted signal is available at the 1/8" socket. The switchable amplification can pre-amplify or even distort the audio signal, if desired.
The InOut is useful even without connecting external gear because the 1/4" sockets are normalized. An input signal of the upper section can be send directly thru the bottom section to pre-amplifiy it or to distort it.