Plugs on machines are OUT tor send orders , IN for receive orders and TROUGH that recopies the signal present on the IN plug .
The signal is transmitted by a luminous flow ( in an integrated circuit situated after the IN plug )
and the ground is not connected on the IN plug .
There is no electric connection ( neither common ground connection ) between the two connected machines ,
therefore no hum by making a loop with the two ground connections .
The machine that
The second machine receives the same orders that the first , if we want that they are independents it is necessary to program them on different channels .
The Din plugs send or receive 16 different channels allowing each to interpret a personal sound of instrument . The channel 10 is destined for percussions .
The order Program Change serves to choose the sound that will be played by a given channel , or a drum kit on the channel 10 .
The order Controller serves to choose some sound values : volume , panoramic , reverberation , chorus …
With sophisticated orders like NRPN , Sysex …. . we can program features on the controlled machine.