Hamish nailed it . Please follow his instructions. Just to re-iterate :
Step 1 : plug in your drum pads via usb to your pc / laptop etc. make sure its driver is installed.
Step 2 : open Reaper. Go to options -> preferences -> MIDI Devices
Step 3 : make sure your MIDI drum pad is showing in the MIDI device and that it is enabled.
Step 4 : open the SM MegaReaper Drumkit project. Press F7 to see the midi tracks.
Step 5 : Make sure that track 3 titled MIDI Processor is armed ( "ar" track button is set to red ) and right click to set the MIDI input to either your detected drumpad ( which should show up in the right click menu ) or set the MIDI input to all MIDI ( and all channels).
Test it by playing it.
Also, read the manual included with the drumkit as well as the Reaper manual section on MIDI input and MIDI devices.
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Salamat
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