Reply to Traktor Jog in Lemur

Hi! I 've recently bought an iPad and Lemur app for use with Traktor. I'm tryimg to get a knob set to endless ,work as an encoder ,for use as a jog dial (just for cueing my track ,not scratching) and some other parameters ,like BPM adjust ,effect select etc. I can't find a way to map it properly no matter what parameters in Traktor I use. Is there something I should know about it. Can anyone help me here please. Thanx in advance