Select MIDI Thru from the Options menu.
Select MIDI Thru if you want to change the routing of MIDI channels received from your MIDI input driver. This can be useful if you have an inexpensive or older controller that cannot send data on more than one channel. For example, if your controller only sends data on channel 1 and you want to hear or record your drums that are on channel 10 on your drum machine, reroute Channel 1 to Channel 10 by setting Channel 10 in the list box of Channel 1.
Modern synths and keyboards are pretty flexible, but if you can't set up your channels any other way you can use QuickScore Elite's MIDI thru feature to help you out.