bitflipper
Drivers should not enter into it. Neither Windows nor SONAR has any knowledge of outboard controllers, as they only see the MIDI input to your interface. If a driver was involved, it would have been the one for your audio/MIDI interface. But because you are able to record MIDI, we can assume that Windows knows about the interface and can communicate with it.
 
From your OP it sounds as though your problem is audio-related rather than MIDI. You can test this assumption by plugging some headphones into the Triton and playing back your track. If you get no sound in the headphones, then the instrument isn't receiving the MIDI you recorded. In that case, verify that you've selected the MIDI device as your output destination, from the dropdown list of Output devices in the track header.
 
If you hear sound in your headphones, then MIDI's not your problem. The next step is to route the synth's output to an audio track in SONAR. You should be able to record that audio, even if you cannot hear it. To hear it as it's playing back (without recording it first) you need to turn on Input Monitoring. That's a button in the track header.

I agree if it is using a regular MIDI I/O but if it is USB then it may well need it's own driver. Hence my question. That's how my external synths work anyway.

If all the routing is correct, and you still don't have sound, make sure the Korg is set to receive MIDI.
There is a setting on the Korg that tells the Korg what will be controlling it (the local keyboard, knobs, sliders or another device). Sometimes called "local control", "MIDI receive", etc. On my Kurz I have the option of Local, MIDI, or both. For me it is in MIDI settings.
 
 Edit: Just glanced at the Triton manual, no need to change Local control. It will always send and receive MIDI data.

jatoth
If all the routing is correct, and you still don't have sound, make sure the Korg is set to receive MIDI.
There is a setting on the Korg that tells the Korg what will be controlling it (the local keyboard, knobs, sliders or another device). Sometimes called "local control", "MIDI receive", etc. On my Kurz I have the option of Local, MIDI, or both. For me it is in MIDI settings.
 
 

That..
 
It is the same with the Yamaha and I think you said it would work as a controller. I think that is where your problem is.
Like I said I have only used my PSR to record audio but these synths were competing at the same time. I don't know if this applies but there is the MIDI Clock that you can set to internal or external, maybe changing that will help, IDK.
On the PSR I can use MIDI IN/OUT or USB, however the manual on the PSR says if using the MIDI in/out to connect the cables to turn the power off to both the synth and the computer then power up the computer (interface) first. then the synth.
Try turning "Local Control" on/off and setting "clock" to both internal and external.
I am guessing here but I think this may be in the ballpark. I think the technology was similar in these two synths.
You may need to use the MIDI send and receive on both the synth and the interface, IDK. Again, just ideas.
There are people here who know a LOT more than I do.. but these are older synths. I don't suppose you need a J.L. Cooper PPS-2, I think it was just for using MIDI and tape.
I think though that if it is working as a controller, you may need to change the internal/external control. Not sure, but probably easy to try.
Someone will chime in and say yes or no... like I said, I'm guessing but trying to help. I wish I knew more. I got out the Yamaha manual because I figured they are similar as far as function. I tried to DL the Triton manual but the KORG link is dead, there is probably another one that works though. Do you have the manual?
 
edit: I just read above that you don't have to change local control SO.. I would try powering down both the synth and the computer/interface, make the connections, power the computer and interface then the synth and wait a minute to see if it starts working. You may get by just stopping sonar and powering down the interface... IDK. Good luck.
 
J
 

Let's go back to basics...
The Korg Triton does NOT have a USB port for MIDI. You must connect the MIDI in/out from the Triton to the MIDI interface connected to your computer.
The Triton will not show up as an instrument until you load an INS file for it. Go to Preferences/MIDI and check that your MIDI interface is listed. After you select your interface, use the Instruments section and define a new instrument using your Triton INS file. (If you don't have such a file, check out www.tritonhaven.com. You'll find an INS file for the Triton there.) Then route the MIDI channels to the Triton.
After this has been accomplished, you should be able to select a Triton bank and program for your MIDI track and record the track from the Triton. Note: if you wish to use the Triton for multi-timbral recording, you'll have to place the Triton into either Combi or Sequence mode. In Sequence mode you can set each of the 16 tracks to a different MIDI channel and record 16 different Triton programs into Sonar.
As for the local on/off, Sonar usually sends a "local off" message to the Triton to avoid note duplication. (Assuming that you opened Sonar after the Triton was powered up.) You can check the local status from the Triton's Global menu.
Hope this helps.