hello andrew and Rolf thanks for your kind answers...
i decided iŽd lay the LX mode on ice for a while until i have mastered all aspects of other things that a webcam can do, moon, planets, sunspots.
since i hve a dobson and my EQ platform is not very accurate, LX doesnt make sense rite now. first build the foundation then the roof. otherwise the house looks weird
thanks andrew for mentioning sharpcap. right now i work with IRIS(french program), then "firecapture", and a couple others.
for stacking i found "avistack" be much easier for beginners than registax.
i already successfully stacked some bright stars (tarazed+altair), fainter stars (mag5) are much harder, i first gotta learn more about the software. have not much experience with imaging so far but stoked to learn more !
with time there will also come better equipment.
PS: i use a serial port arrangement, then a DIGITUS serial-to-USB adapter. a brandnew one which can handle much dataload.