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