Hi out there!
 
I hope to get your help with this issue... We are using Sonar X3 Producer "live on stage", love it and just got a Midi Gain Controller on the stage now (). 
 
Appsys provides a VST and external programs to control it, but I´d rather map the gain knob within Sonar to control the gain. 
Is it possible to write gain changes to a certain Control Change (CC) messages? How??? Any help is appreciated!
 
Thanks and greetings,
Andy

Try using ACT and use MIDI learn to map your controller to Sonar.

Mmmm. But I need it the other way around: I want to control the physical gain controller on stage using midi cc commands send from the channels gain knob from Sonar... You can find the controller product here: 
appsys(.)ch/en/products/remotegaincontroller

OK I see. Here I would not worry about MIDI CCs. The VST should send the right data to the controller. What you may need to do is set up the VST to output to the right port that has the controller on it.  

Well, what does the documentation for the product indicate, as far as it responding to incoming MIDI messages?
 
I would think a CC 7 for volume would be it, but it could be other values - it's whatever their device responds to, if I am understanding what you are trying to do.
 
Bob Bone
 

I see from the doc from the link you posted:
 

• Manual setup: Gain is adjusted via standard "Control Change" messages. The default scheme is:
  MIDI Channel = Preamp, CC = Input, Value = Gain. E.g.

MIDI Channel 2 = Preamp 1, CC 24-31 = Input 1-8, Gain = Value 0-127
MIDI Channel 3 = Preamp 2, CC 24-31 = Input 1-8, Gain = Value 0-127
MIDI Channel 4 = Preamp 3, CC 24-31 = Input 1-8, Gain = Value 0-127
Above mapping can be further adjusted via SysEx commands, please refer to the manual. 
 
The above seems to me what you are trying to do, so you would be essentially trying to map the gain knobs on some channel strips to send the gain values to your device?  So, if that is correct, then you need to map the midi data output from each associated channel's gain knob to send midi gain values through a specific CC # (24-31), with channel 1 getting mapped to CC 24, channel 2 mapped to CC 25, etc..  Is THIS what you are trying to do?
 
Please explain your actual goal, so I can make sure I am giving you information that applies to what you are attempting - thanks, 
 
Bob Bone
 
 

Cheers Bob!
Yes, that is exactly what I want to do...   :-)

I guess what I don't understand is why you wouldn't just set your input gain to start with, and if you needed to adjust an individual channel's gain in Sonar, why not just adjust it in Sonar?  You are already seeming to want to turn the channel gain knobs to generate midi data to control volume, or am I REALLY missing something?
 
Bob Bone
 
 

We are using three (temperature wise modified) Behringer ADA8000 ADAT controllers for input and output on stage. Each one of the 24 channels has a separate hardware gain control potentiometer. We modified the hardware and installed opto-couplers to be able to control all 24 "hardware gains" via Midi commands from the control seat way of the stage...

To make it short term:
I want to use the Sonar gain knobs to control the "real world" gain knobs via midi CC commands.