[A6] Portamento bug?

[scd]

Would like to see this confirmed:

Having a whatever sound, turning on portamento, give it  time 4, speed 
set to octave and mode to normal, you can choose different curves for 
the way the portamento behaves. They all work fine, but if you choose 
the last curve (scurv2) playing notes on the keyboard (well, at least 
my A6), give all weird pitch-behaviour.

If I play for instance D-F-G-A / D-F-G-A / D-F-G-A etc only the first D 
is a D, the rest of the D's is an A....

If you set time to 2 it acts normal, if you change the time to a higher 
value all kinds of strange pitch things happen...

Weird. Or do I miss something here??

Boele