Samson Graphite 49 - USB/MIDI Keyboard Controller - Manual (Page 26)

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MIDI OUT
In addition to USB, the Graphite 49 features a MIDI OUT jack. The USB communication
protocol supports four virtual USB In ports and four virtual USB Out ports. MIDI messages
from the keyboard set to Port 1–Port 4 are transmitted via the USB Out. Messages sent to
Port 1 and Port 2 are also transmitted through the MIDI Out terminal if the Local switch
is set to On. This is the default setting. Messages sent to Port 3 and Port 4 will not be
transmitted through the MIDI Out terminal. Messages received from external device or
computer software through the USB In Port A will be transferred to the MIDI Out terminal.
The USB Out Port 5 is used for the remote control only.
The diagram below shows the configuration of the MIDI Chain.
KEYBOARD USB VIRTUAL PORT
Out Port 1 In Port A
Out Port 2 In Port B
Out Port 3
Out Port 4
Out Port 5
(For remote control )
Local
MIDI OUT
COMPUTER
USB