Everything works except for recording from 2 programs simultaneously. I uninstalled/reinstalled. (Full excerpt available.)
Error during reinstall (completed fine):
</s>Error! There are no instances of module: seeed-voicecard<e>
Also, there’s this problem (no dsnoop shown):
</s>$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: seeed4micvoicec [seeed-4mic-voicecard], device 0: bcm2835-i2s-ac10x-codec0 ac10x-codec0-0 
Subdevice #0: subdevice #0
While troubleshooting, I uncommented 2 sections in the 4-Mic’s /etc/asound.conf but that didn’t resolve the issue.
Multiple recordings test:
</s>$ arecord hello.wav
arecord: main:788: audio open error: Device or resource busy<e>
</s>$ arecord -D dsnoop test.wav
ALSA lib pcm_dsnoop.c:618:(snd_pcm_dsnoop_open) unable to open slave
arecord: main:788: audio open error: No such file or directory<e>
Help appreciated, thanks!