There are two main ways to connect MIDI devices. They are called a Thru configuration or a Star configuration. Both are shown below
Below is a diagram of a MIDI "thu configuration", also called a "daisy chain".
If more than one device has the same MIDI channel(s) set to the "on" value then those devices will "sound" when the trigger is played as well as respond to any other channel messages on that channel sent from the trigger. If you would like to control which devices you hear we would suggest you designate different channels to different devices and then set the transmission channel of the MIDI trigger to correlate with the device you wish to hear.
Set the first device to receive on channels 1-5, set the next device to receive on channels 6-11, and set the third device to receive on channels 12-16. Or any combination thereof ; then set the transmission channel of the trigger to be one of the same channels of the device you wish to hear when you play.
The maximum number of devices recommended to connect without latency (not including the trigger) is 3.
Below is a diagram of a MIDI star configuration. This configuration requires that all MIDI channels of all receiving devices be set to the "on" value.