Hi scottjua. I got your PM.
As I'm sure you know, the SaberSD is not designed to run a single LED. It is instead designed to run the Hyperdyne LED driver board that in turn runs an LED string blade, not a single LED. In my testing, I was only able to get the SaberSD to control when the auxiliary flash LEDs of a 4 die LED (10W LEDEngin) light up. In actuality, the main LEDs AND the Aux flash LEDS all ran straight off of the batteries and I was only able to make this all work using a DPDT latching switch. Again, all the sound board did was control when the aux flash LEDs lit up. The auxilliary button used for lockup was actually a hinderance with the way I wired things up and was best unused but if you are not useing a 4 die LED for aux flash then you should be ok using it... but you will not be able to get any lighting effects with it, only sound.
Now as also posted in my thread by cannibal869 regarding Aux flash with the Saber SD, it may be possible to drive the aux flash from the clash putput on the sound board in conjunction with a Plecter Labs Power Extender (PEX) which can be bought from Plecter labs or from TCSS. However in this case you are still driving the LEDs from the batteries and are still forced to use a DPDT latching switch.
Anywho, Aux flash is not really your issue here. You want to be able to turn off and on the driver board and the SaberSD board using only one switch and you want that switch to be an SPST (single pull - single throw) momentary. This might be possible but it depends on the driver board in question. The driver board has to allow for a momentary switch and also has to have the ability to control the main power to the sound board. if it does not have these things, it's not going to work off of an SPST momentary switch. Since I am not familiar with how your particular Corbin driver board works, I sadly cannot tell you if it can do this and if it can, how to do it.
The other way to do this, if possible, is to have the sound board control the power to the driver board. Since the SaberSD is designed to do this anyway using the Hyperdyne LED string driver board, perhaps there is a way to wire it up so that it can control a different driver board. Again though, I have not tried this yet and the results may vary depending on the board being used. The ones I have are newer than the Corbin board but older than what is currently being sold by TCSS and I am saving them for my SaberSD, lol.
Sorry I could not be of help. Best of luck to you on this.