Hi there Hank. Since it's the weekend, thought I might just catch you playing with your TI.
Sounds like you've almost got it, but not quite. Firstly though, you don't mention how many midi ins and outs your computer's midi interface (or sound card) has. If it only has one in and one out, a good bit of advice is to score yourself a more verstatile midi interface. For example, mine has four outs and two ins.
For the time being though, and for the purposes of this discussion, I'm going to assume your computer only has one midi out and one midi in.
You need to keep the same setup as you had with just your Triton - that is; Triton out to computer in and computer out to Triton in. To add the Virus to the setup, simply connect the midi thru on your Triton to the midi in on the Virus (or as Doc Jones suggested - no difference). So now (providing the computer is switched on of course) the keyboard on your Triton can control either its own synth section, or the Virus via midi channel selection.
In order for Sonar to record the knob movements on your TI as well as note data from your Triton's keyboard is maybe less straightforward, and you have several options:
* Unplug the midi out from the Triton and plug it into the Virus's midi out instead.
* Buy (or solder up yourself) a simple midi switch that can flip-flop between both
* Get yourself a USB midi interface (or soundcard) that has two (or more) midi inputs. For example, Emagic MT4. M-Audio 2x2, Edirol UM-2C, etc. This is my preferred method.
* Get a midi merge box that can merge the midi data from the Virus and the Triton into one midi stream. (These aren't particularly cheap by the way and a new midi interface may well be a better investment).
* Get a midi patchbay, as Doc Jones suggested. Might be a bit of an overkill though, given that you only have two devices.
In terms of midi sync (preumably to get the Virus arpeggios to run in time), I'm not familiar with Sonar, but hopefully it will pass on the midi timecode it receives from the Triton at its midi out. May need some settings adjusting in order to achieve this - dunno. Otherwise, you may need to control your sequences from the computer instead.
Finally, my understanding of device IDs is that they are usually used for system exclusive data, and are not normally involved in general sequencing operations. Different devices are typically split by midi channel, in much the same way as different parts within your Triton are split by midi channel also. Doc Jones was probably referring to the operation of his patchbay, which may have assigned device IDs to do its job effectively. Dunno.
Hope this has been useful.
Mr O