I dont quite follow you. What do you mean, no sound?
I dont know the Roland, I assume its a digital recorder. It's not a sequencer that I am aware of.
Midi doesnt "make" sound, think of it like a player piano. The midi on the Roland is used to sync stuff together, or record midi info etc, but I dont think it has an onboard sequencer, maybe I am wrong
You are trying to sync the midi sounds of the Triton (and it's internal sequencer) to the audio tracks on the Roland recorder, right?
The basic brief is to have your sequence together on the Triton, then slave it to the midi clock that the Roland sends. For this you need to reverse the connection that you have now and go out of the Roland and into the Korg. Be sure the Roland is set up to be the midi clock master and the Korg is set up to be the midi clock slave.
Some Korg products have a convenient setting called 'auto' as a third option with 'master' and 'slave'. If this is available on the Triton it's the one you should use because it will slave to a midi clock if one is available, but not lock up if one is not available. This setting will let you add to and modify your sequence as you go without going back and forth to the clock page all the time.
Another thing, just in case my interpretation of what you said is correct...
Everyone else is correct... the VS unit will act as the controlling unit for your sequences (I run this very same set-up).
YOu have a sequence that you want to sync with the VS... let the VS act as the main "Start & play"... and the Triton should follow happily along.
But, if you're not hearing anything it may be because you're only "controlling" the sequence of your Triton... you still will have to run your Master Audio Outs (be it digital or analog) to the VS unit in order to hear anything.
The MIDI information only acts as a program interface, changing patches and/or playing a sequence in time to the VS unit.
Another thing... I only have the VS1880, but I'm sure you'll have to make sure that the BPM (tempo, internal VS clock) is set for the same 'speed' as you Triton sequence.
Good luck to you... it is so exciting when these two work in hand-in-hand!