How do you configure a midi track to play external sound module stereo sound IE: piano or drums. In previous Cakewalk I would set the pan at -1 (0=left and 127=Right). This had the effect of disabling pan

I'm not clear on what the issue is, exactly, but to disable a MIDI control, right-click it and choose Disable Control.

OK, I will try that. To clarify, midi track assigned to play a stereo program on my external sound module, causes it to  in mono

Midi note information is, in a way of speaking, a mono data bite,  But it can also control the playback synth's pan, volume etc. The question I have= Is sound only coming from one side of the stereo field, or is it Mono??, those are two different scenarios. 
 
Mono implies an equal sound from both left and right. If this is the case then the synth has an issue.
Or are you talking about a multi channel situation where intruments are panned but this is not happening? 

Set the MIDI pan (CC 10) to 64. MIDI data itself is neither stereo nor mono, that's entirely up to the sound module. CC10 just instructs the module where to pan. If you've got the MIDI track's pan centered and you're still hearing mono, make sure you're using both outputs from the module, that they're routed to two separate channels in your mixer, and those two channels are individually panned hard left and right respectively.

I think what he's saying is that he's setting an off-center pan position on his synth, and SONAR is sending center pan on starting playback because the pan control in the track header is active. Disabling the control will prevent that, but then the panning should be controlled by CC10 events or automation on the MIDI track or (usually preferred now) on the audio track receiving and input-echoing the hardware synth's output through SONAR. But it may be that the OP is direct monitoring the synth and needs to control the panning with MIDI or with presets in the synth the old-fashioned way.
 
 

Thanks everyone. In old Cakewalk, I could disable the pan by setting to[ -1]..then the pan window would be blank. Piano programs, drum programs and some string programs  that were stereo, would play in stereo. I want to kinow how to do this in X2. What was a nice stereo track in Cakewalk Pro Audio 9 is now forced mono by the centered pan option.
 
I know this is really oldschool,.... external sound modules. I have literally THOUSANDS of midi songs that I have built this way over decades.
 
I appreciate everyone's attention to this.

ceasehope
I could disable the pan by setting to[ -1]..then the pan window would be blank.

See post #2. When a control is disabled in X3 (and all versions of SONAR) the value will have parentheses () around it.

Ah, I get it. You don't want SONAR to send any pan instructions to the synth at all, and control panning entirely at the synth itself. In that case, brundlefly's supplied the answer.
 
I'm on 8.5, but in this version of SONAR the pan slider is disabled by default, as indicated by the check mark next to "Disable Control" in the context menu. Moving the slider automatically enables it, after which it remains enabled even if subsequently re-centered with a double-click. 

Thank you Mr Brunlefly, disabling with right click does the job perfectly. I bought X2 Producer when it first came out, but because of this function haven't really used it. I bought all the Sonar books and searched all the forums. It is such a simple thing, I feel silly now. I had such a fast workflow on cakewalk Pro Audio 9 that I just couldn't afford the time investment if Sonar wasn't intuitive. I still think there are a lot of things that slow me down on Sonar. maybe I can come up with a custom interface.
 
Mr Bitflipper,  thank you too. I listened to your songs, quite impressive!