Ducking with MIDI?

I'm adding midi trax and would like to side chain to duck a guitar under them.
One MIDI track was made thru the Browser and one was added later thru Right click on the Track area.
They are both using the TTS1 for harmony saxes. So far so good.

The first one has a little Keyboard Icon and on the audio tab I can "Send" to the Comp on the Guitar which works for ducking but the second has a MIDI cable plug Icon and has no Audio or Midi tab and no " Send" area?
Thanks

So I should have set up the second track as a second instance of TTS1 rather than as just making a new MIDI track?
I am going to change track 2 to another instrument in any case but thought I'd be able to do that with one instance of TTS1 by assigning it to channel 2?

Very clear point by point but the key board still plays channel 1 (piano) even tho I am on Midi 2 track( organ)
Perhaps I need to go back to your first assumption?

1."I'll assume you already have TTS-1 loaded 
(BROWER, +, INSERT SYNTH> TTS1> POPUP =SIMPLE INST TRACK, SYNTH PROPERTY PAGE, RECALL ASSIGNABLE CONTROLS,> OK> CREATES A TRACK)
with it's output set to TTS-1 
(THE CREATED TRACKS' OUTPUT(INSPECTOR VIEW) DOES NOT HAVE A TTS-1 OPTION, ONLY THE SOUND CARD AND MASTER & BUSSES)
and an instrument track with it's input set to Output one of the TTS-1.
(INPUT SET TO "ALL INPUTS, MIDI CH1") 

Thanks FBB
Starting from scratch.
Install TTS1 from browser (+> Insert synth TTS-1)
It makes an instrument track that looks like an Audio track
On the Inspector View of the track, it sets "I" to Omni (on the drop down it shows"none" as selected and there are other choices of All Inputs, (my soundcard) and (my keyboard) as options and all have dropdowns that have "MIDI Omni, Midi ch 1,2,3 etc)
And "O" is set to master in the inspector. (no option for TTS1)
Master is set to my soundcard
It plays and records the piano which is channel 1 of TTS-1

Part 2
Per your points.
1. insert a midi track (rt clk in track view>insert midi, shows midi Icon, name it Midi 2 for reference)
2. Set output to TTS-1 (Done)
3. Change to CH 2 (In the Inspector there is a bar that replaced the Master bar and it has "snap to scale, quantize, arpeggiator etc. at the bottom it has a place to change to CH 2) (Done)
4.Set it's input to your keyboard/controller (so, back to the left bar, (change from "I"= Omni to "Alesis">Midi Omni)
5.Insert an audio track (rt click on Track pane header,  insert audio, call it Instrument 2)
6.Set the input of that to "TTS-1 Output two (done-Output 2 mono left)
7.Make sure that "Instrument track 2" has its output set to your master (done automatically)
8.Open TTS-1 and change the patch on channel two to the instrument you want to use (change ch 2 on TTS-1 GUI to organ)
9 thru 13 -set TTS1 System> Part 2 to Output 2- Mult. Outs checked(Done and closed)
Select Track 1, play keys, still hear piano as before
Select Track 2 (Midi2) play keys but only hear piano tho both meters working.
I really don't see where I'm screwing up.
Sorry for all the trouble.
Sigh.

Just double checked my instructions in case I've missed something and they work here. It's hard to know why it isn't working.

Very bizarre. What do the TTS-1 meters show? Open its interface and with MIDI 2 "in focus" hit a few notes.

Do you see the meter of channel 2 on the TTS interface move?

Yeah that's the odd thing.
With Either track 1 or 2 selected, both track meters are active and always only channel 1 meter on the TTS GUI 
Instrument track 2 meter never works even if selected.

On the TTS GUI, CH 1 says piano and CH2 says organ.
In it's system /options /outputs, Part 1 is piano, part 2 is organ, and organ is set to output 2 and multiple outputs is checked.

Erased all tracks and TTSI
carefully followed the same instructions
unfortunately to the same results.

Thanks for your time on this. I have learned a lot and I do have a fallback position where I simply do a second (or more) instance of TTS1 for other tracks and set the CH 1 to another instrument..

If I was the OP just strating out with mIDI I would experiment with a basic track.

One midi instance- in this case TTS
One audio track with gat.

Use the audio track from the midi event  to send to the compressor on the gat track.

I have a feeling that since he is using two channels on the TTS he is screqwing something up. I can't visualize exactly what is happening here.


Is the OP familiar with setting up sidechaining between audio tracks?