Lowest Sampling Rate for ADC input (DAC+ ADC Board)

Hi everybody,

as stated in the Title i wanted to know if there's a way to use a slower sampling rate than 44.1kHz for recording data. (at least i couldn't make it happen)
The DAC+ outputs work fine even for 8kHz sampling.

The issue is, that i do some filterung with a deadband and a pretty long filter. if i sample too fast the filter will be immensely long and through the deadband i'd get a huuuuge buffer :(.

Hope i used the right forum/way to ask my question. Also i hope the question hasn't been asked somewhere else.

Best regards
JPH