It's not really important, but i noticed this point in the User Manual :
For me, using ECHO USB IN on DIN, USB, or BOTH allows the MIDI Output (5-pin DIN and/or USB) to also act as a MIDI THRU; like it is written for ECHO DIN IN.MIDI MENU PARAMETERS
ECHO DIN IN (MIDI MENU 2.3)
This parameter takes incoming MIDI data from the 5-pin DIN MIDI Input jack and merges it with the data being sent from the Sub 37 to the selected MIDI OUT port(s). This allows the MIDI Output (5-pin DIN and/or USB) to also act as a MIDI THRU. The choices are OFF (default), DIN, USB, or BOTH.
ECHO USB IN (MIDI MENU 2.4)
This parameter takes incoming MIDI data from the USB PORT and merges it with the data being sent from the Sub 37 to the selected MIDI OUT port(s). This allows the MIDI Output (5-pin DIN and/or USB) to also act as a MIDI Merge. The choices are OFF (default), DIN, USB, or BOTH.
Merging is the combination of using both ECHO DIN IN and ECHO USB IN, isn't it ?
Signals comming from DIN and USB should be merged to DIN, USB, or BOTH MIDI Output(s).
Could be usefull for a next User Manual revision
