How to use counters NI 6363

Hi

I got to use the counters on the NI 6363. My problem is, I got a nearly full card.

So my question is. If I use a counter out i.e. CTR 1 OUT, can I use the other pins (CTR 1 Aux/SRC/Gate) for some digital signals? And on the other way the same question if I use CTR 2 Gate?

Did I need to use a Counter out to greate a variable square frequency or does the digital out is enough (fmax<500Hz)?

Thanks