Introduction to MIDI and Computer Music: Troubleshooting
First, try to figure out whether Reason is receiving MIDI messages from your MIDI keyboard. Make sure you have a device selected to receive input in the Reason sequencer. It will have a grey arrow superimposed on the picture of the device in the sequencer. When you play notes on your MIDI keyboard, that arrow should light up green.
If MIDI communication doesn’t seem to be working, do these things, in this order.
If MIDI was working, and you just weren’t hearing audio, check that you can hear sound made by other programs. If you can, create a new Reason song file, and see if you can get sound out of that. (It could be a problem just with your song file.)
Look for the AUDITION and ARP ON/OFF buttons on the Korg keyboard. If either of these is lit up red, press it to turn it off. Those two functions send MIDI note messages out of the keyboard. These find their way into the Reason device that is set to receive MIDI input.
Redrum responds to the first 10 chromatic pitches starting with the C that is two octaves below middle C (that is, MIDI note number 36). Notes that are higher than MIDI note number 45 do other things, such as toggle the mute status of each of the 10 channels. If you’re sure that you’re playing the right notes to trigger sounds, the problem could be that your MIDI master keyboard is set to transpose the notes that you play, so that what is normally note number 60 (middle C) is now note number 72 (or something else). On a 61-key keyboard, that makes the notes that would trigger sounds inaccessible.
To fix this on the Korg Triton Le, first be sure that you are in PROG mode, not COMBI mode (the buttons to the left of the display). If that doesn’t fix the problem, press the GLOBAL button, and look for the Key Transpose setting. It should be set to 0.