Had time to download the .pdf manual for your controller, took a look.
It does not look like it will send on ALL channels, but only 1 thru 16 and OFF.
But I should think that sending on channel 1 would do the trick.
Something is up at your end, can't imagine what it might be, suggest you contact Studiologic Support and see if they might be able to shed some light.
I don't have that particular controller here, but can at least tell you that the SD2 has worked here standalone with three different MIDI keyboards, one is a full fledged controller, the other two are MIDI keyboards with built in synths, but connecting their MIDI Out to the SD2's MIDI In will indeed work to control the SD2.
--Mac
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"Keep listening. Never become so self-important that you can't listen to other players. Live cleanly....Do right....You can improve as a player by improving as a person. It's a duty we owe to ourselves." --John Coltrane
"You don't know what you like, you like what you know. In order to know what you like, you have to know everything." --Branford Marsalis