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Power:           9V - 18V DC negative 
tip 2.1mm jack. 10mA or greater
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empress midibox
The Empress Midibox performs a simple function. It 
allows MIDI signals to be processed by Empress pedals 
that have a control port. The current-based MIDI 
protocol is incompatible with the voltage-based 
Empress control port. The Empress Midibox simply 
converts the signal from current to voltage.
The Midibox does not convert a MIDI signal into an 
analog signal. The Midibox can't be used to output CV 
signals. The Midibox can't receive MIDI signals from 
Empress pedals, it can only send MIDI signals to Empress 
pedals.
midi thru: sends out the signal received by the midi in  
connector. This signal is unchanged by the midibox and 
is useful for connecting other MIDI devices to the same 
source and daisy chaining MIDI devices together.
midi in: connect using a standard 5 pin MIDI cable 
to any MIDI compatible source. 
control ports:  connect this to a control port on your 
Empress pedal using a standard patch cord. You can 
connect up to 4 Empress pedals.