problem lfo sync

hi all.
so i have to post this question cause after spending lots of time on it i am really unsure as to what is going on.
so i have issues with syncing my voyager rackmount lfo with midi. actually not exactly, cause i can technically sync the lfo without problem to logic. my problem is that when i go into the midi clock divider, you can hear the effect roughly until 16, but any attempts to go lower in lfo speed is a failure.
you can kind of hear he is trying to get there, but no.
i also realize that when i select off ext for the lfo, it looks like it still reads the mid clock signal and i cant change it using the lfo rate knob.
has anyone experienced this before? or maybe would have an idea as to what is happening?
thanks in advance!
cheers!