You did not provide any information about kernel or OS.
Debian 8, AMD64, 3.16
Are you not using pulse audio?
No, pulseaudio has been entirely removed from my machine.
On the alsa page there are some instruction how to configure the devices properly, so that you have consistent mapping.
Unfortunately i have no idea what kind of device numbers are exists on the Audigy Rx and if ALSA recognize it badly, then the current layout maybe only partially correct. So, i don't know what aliases should i make. As for the commands:
root@Csabi:~# uname -a Linux Csabi 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux
root@Csabi:~# lsmod | grep snd snd_emu10k1 148204 3 snd_util_mem 12747 1 snd_emu10k1 snd_hwdep 13148 1 snd_emu10k1 snd_rawmidi 27024 1 snd_emu10k1 snd_seq_device 13132 2 snd_rawmidi,snd_emu10k1 snd_ac97_codec 118711 1 snd_emu10k1 snd_pcm_oss 44798 0 snd_mixer_oss 22042 2 snd_pcm_oss snd_pcm 88662 3 snd_pcm_oss,snd_ac97_codec,snd_emu10k1 snd_timer 26668 2 snd_pcm,snd_emu10k1 snd 65338 13 snd_pcm_oss,snd_ac97_codec,snd_hwdep,snd_timer,snd_pcm,snd_rawmidi,snd_emu10k1,snd_seq_device,snd_mixer_oss soundcore 13026 2 snd ac97_bus 12510 1 snd_ac97_codec
root@Csabi:~# amixer Result is here: http://oscomp.hu/depot/amixer.log
root@Csabi:~# amixer -c 0
Result is here: http://oscomp.hu/depot/amixer_c0.log
root@Csabi:~# amixer -c 1 Invalid card number.
It could be something in kmix, but I doubt it.
Unless, it's really that ALSA reports badly something to KMix, it's a KMix issue.
- TCH