multi/stack mode question

In a few of the default multis (The Friend of the Raving Guy, for example) some of the layers are drums which will play the same note across the entire keyboard. I've been unable to duplicate this. Does anyone know how this works?

If I load a new patch into the kick drum part of the aforementioned multi, I lose this effect and get a different kick drum note on every key. (the arpeggiator, which provides the beat, is also reset but that's easy to reprogram)

I've spent hours and can't figure it out.

TIA,