What are your figures from your DAW? I calibrated at 0% pan spread, both L and R inputs measuring -12.0 dBFS. These are my results after the 1.6.4 update:
pan at 50%=
voice 1 L -12.0, R -13.7
voice 2 L -14.1, R -12.1
voice 3 L -12.4, R -18.2
voice 4 L -18.0, R -12.3
voice 5 L -12.2, R -25.5
voice 6 L -25.6, R -11.8
pan at 100%=
voice 1 L -12.0, R -17.3
voice 2 L -17.8, R -12.1
voice 3 L -12.4, R -37.9
voice 4 L -38.0, R -12.3
voice 5 L -12.2, R - silence
voice 6 L - silence, R -12.3
I tried to get pan as close to 50% as possible, I did it by sight as I don't have an editor hooked up right now. Notice in every instance one input hovers near -12dB.
At 50% the progression starts at -2dB, then -4dB, then -7.5dB (on alternate voices).
At 100% it starts at -5.5dB, then -20dB, then silence.
That seems pretty normal.
What values are you seeing?