How to set HDMI card - default audio card

Hello everyone I'm Use laptop + external monitors, and i need use monitor speaker and i can't see HDMI card in alsamixer, when reviewing command [ aplay -l ] result = [void@base ~]$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: CX20757 Analog [CX20757 Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [BenQ EX2710] Subdevices: 1/1 Subdevice #0: subdevice #0 and when reviewing command

[void@base ~]$  cat /proc/asound/modules
 0 snd_hda_intel

other thing : I'm using void-base system and some xorg services and dwm window manager allright i need know how to set HDM card to defult audio card