K0TO asked (darn, how to make a slashed zero?): >Any suggestions on which card(s) might be 'cleaner' than others? That might be one that audiophiles could better answer, but seeing how amateurs use computer sound cards in applications where anything outside 300 cycles to 3 kc isn't needed, hanging a good LPF on the output might be worth a try. 73, VR2BrettGraham