same here, resets at 1, starts at 2. i've never had a problem syncing midi
clock from any source to the a100. i do this regularly using either software
(logic, reaktor, or max) or an mpc.

patching my a190 clock directly to the a155 usually results in the a155
running at light speed which is too fast for my taste.

i nearly always patch midi clock from the a190 into an a160 clock divider first,
then to a155. more useful divisions of tempos that way. also, if you have an
older a155 which steps randomly and sways a bit (nice!) when fed a
sawtooth, the 160 will straighten this out too so the stepping is no longer
random.

fun to send clock from the a190 to the a113 as well. this provides 'even' as
well as 'uneven' divisions of clock which can be mixed and fed to your a155's
clock input. can be downright funky, though often hit or miss (literally). one
cool possibility of doing this is switching 'mixturs' on the a113 for rhythmic
shifts while flipping the switches around on the a156 cv quantizer to change
note groups.

speaking of funky clock, i'm curious about blacet's new 'binary zone' clock
tool. looks interesting though i can't really figure out what it does just by
looking at it.

-psm