i think its a problem with the capture settings in alsamixer.
try ‘alsamixer -V capture’ and make sure you have selected only the inputs you are using. disable any ‘mix’ type capture inputs.
hopefully the manual is translated to your language, so ‘man alsamixer’ might be more useful than anything i could type here
good luck with it all.
I have an Audigy as well and often have the same problem. For some reason, the default setting for emu10k1 cards likes to default with the PCM capture turned on. As nick_m said, in alsamixer or your favorite mixer program, turn off PCM and for good measure Analog Mix as well for your capture. Might just be safer to keep only the sources you are recording on for capture.