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Performance Mixer Input Module
Module A-138p is the 4-fold input module,
controls and inputs for each channel
input (3.5 mm mono socket)
gain (control to adapt different audio levels)
Level (the main volume control)
internal jumper for each channel to choose between Aux pre/post main Level control
internal connection to the output module and to other A-138p modules
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These merchants probably sell this module. Huh?