How do I change the default sound card?

[zirconx]

I would like to change the default audio to the headphone jack. I am running dietPi (no gui/de).  I know I can change the alsa default card with an environment variable or asound.conf, but I think that only affects alsa utilities. I'm also using sox, so I just want to change the default (first) card at the OS level.  Actually I could settle for getting sox to pick up a different card by default but I have not been successful in that.

So I think I need to create a file in /etc/modprobe.d, with lines like 

options sunxi_sndcodec index=0
options sunxi_codec index=1

I also tried reversing them:

options sunxi_codec index=0
options sunxi_sndcodec index=1

but it's not working. The hdmi output is always listed as the first card.

Code:

root@DietPi:~# cat /proc/asound/cards
 0 [sndhdmi        ]: sndhdmi - sndhdmi
                      sndhdmi
 1 [audiocodec     ]: audiocodec - audiocodec
                      audiocodec

I'm just guessing at the driver names based on lsmod. Any ideas? Thanks.

here's the output of lsmod.

Code:

root@DietPi:~# lsmod
Module                  Size  Used by
vfe_v4l2              747618  0
videobuf2_dma_contig    17668  1 vfe_v4l2
ir_lirc_codec          12756  0
lirc_dev               17032  1 ir_lirc_codec
videobuf2_memops       12546  1 videobuf2_dma_contig
mali                  199851  0
ir_sanyo_decoder       12491  0
ir_sony_decoder        12489  0
ir_jvc_decoder         12487  0
ir_mce_kbd_decoder     12628  0
ir_nec_decoder         12487  0
ir_rc5_decoder         12487  0
ir_rc6_decoder         12520  0
sunxi_ir_rx            12902  0
videobuf2_core         30952  1 vfe_v4l2
vfe_io                 34085  1 vfe_v4l2
ss                     33083  0
cedar_ve               17368  0
sunxi_i2s              13081  2
sunxi_sndcodec         17150  1
sunxi_codec            63040  1