Channel 2? Or 01 in the DUMB control. Check it, it's still panned.

FT2's panning isn't strictly linear:

// generate FT2's pan table [round(65536*sqrt(n/256)) for n = 0...256]

for (i = 0; i < 257; ++i)

p->PanningTab[i] = sqrtf((float)(i) / 256.0f);

Where the panning range is 0 through 256, left volume is PanningTab[256 - pan] and right is PanningTab[pan].