Midi automation does not work when export mix with SONAR X1

My setup

• Windows 7
• SONAR X1
• Virus TI Snow version 4.5.3.00 used as soundcard

I have two midi tracks driving the Virus TI loaded as synth plugin in an audio track.
Both tracks contain midi automation to controller 1 (mod wheel) and 12, to drive some "soft knobs".
When I play the song, all automations work. But when I export the mix, in realtime, automations are not applied : the Virus sounds remain in the state as it were when I prevously stoped the playback.
Any idea about this problem

[Blockierte Grafik: http://i42.servimg.com/u/f42/13/52/69/04/sonar_10.jpg]

It's seems that the problem comes from SONAR, not the Virus : SONAR does not render midi automation in real-time bounces ! Why ? There are no explanation and users expose this problem since the version 7 !

The issue is this : don't draw automations in the midi tracks, but in the audio track where the Virus host is loaded. Of course in this case no midi automation are possible, but you can draw automation on Soft Knob 1 to 3, for the 4 patches, and that's what I need.