The MIDI Solutions Quadra Thru is a 1-in 4-out MIDI Thru Box. All MIDI messages appearing at the input are sent to all four Thru outputs. Active circuitry cleans up any skewing of MIDI data bits that has occurred at the input, ensuring reliable operation in setups that require daisy chaining or long cable runs. 

The Quadra Thru is MIDI-powered, and requires no batteries or power supply to operate with most products. A MIDI indicator LED lights up when the product is powered and flashes when MIDI data passes through it. 

MIDI Solutions Thru boxes provide additional MIDI Thrus wherever required in a MIDI setup. For example, if you need to send a single MIDI data stream from a sequencer to a number of sound modules, you can use a Thru box to provide extra MIDI connections to those modules. 

As MIDI devices are daisy-chained from one to another, MIDI signals gradually lose their integrity due to passage through optoisolaters at the devices' MIDI inputs. MIDI Solutions Thru boxes can be used to clean up the MIDI signal at any point in the chain where it is starting to become unrecognizable (actually all MIDI Solutions products clean up MIDI data in this way). Be careful of other Thru boxes that amplify errors along with the signal; MIDI Solutions Thru boxes actually read in the data and re-clock it out at the correct baud rate, eliminating any errors that have accumulated due to daisy-chaining or long cable runs. Because of this, MIDI Solutions Thru boxes can also be used to extend a MIDI connection further than the standard 50 feet. By connecting Thru boxes in series it is possible to extend the MIDI cable length by 50 ft. at a time.