I did the following:
sound.extraConfig = {
#
# asoundrc entries for Traktor Audio 6
# Carl Brothers <decibelkaos at gmail.com>
#
# These options will Enable/Disable the passthrough on your Traktor
# Audio 6. Personally, I just created shortcut buttons with the
# commands, and it works flawlessly.
#
# amixer -c T6 cset numid=1 on # switch PASSTHRU on channel A
# amixer -c T6 cset numid=2 on # switch PASSTHRU on channel B
# amixer -c T6 cset numid=3 on # switch PHONO/LINE on channel A
# amixer -c T6 cset numid=4 on # switch PHONO/LINE on channel B
pcm.T6_capture {
type dsnoop
ipc_key 1646
slave {
pcm "hw:T6"
period_size 0
buffer_size 65536
rate 44100
channels 6
}
}
pcm.T6_playback {
type dmix
ipc_key 1646
slave {
pcm "hw:T6"
period_size 0
buffer_size 65536
rate 44100
channels 6
}
}
pcm.T6_duplex {
type asym
playback.pcm T6_playback
capture.pcm T6_capture
}
pcm.T6_pair1 {
type plug
ttable.0.0 1.0
ttable.1.1 1.0
slave.pcm T6_duplex
}
pcm.T6_pair2 {
type plug
ttable.0.2 1.0
ttable.1.3 1.0
slave.pcm T6_duplex
}
pcm.T6_pair3 {
type plug
ttable.0.4 1.0
ttable.1.5 1.0
slave.pcm T6_duplex
}
};
And it’s giving me the following output error:
error:
… while evaluating the attribute 'config'
at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:9:
321| options = checked options;
322| config = checked (removeAttrs config [ "_module" ]);
| ^
323| _module = checked (config._module);
… while calling the 'seq' builtin
at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:18:
321| options = checked options;
322| config = checked (removeAttrs config [ "_module" ]);
| ^
323| _module = checked (config._module);
(stack trace truncated; use '--show-trace' to show the full trace)
error: syntax error, unexpected '{', expecting '.' or '='
at /etc/nixos/configuration.nix:181:16:
180|
181| pcm.T6_capture {
| ^
182| type dsnoop
building Nix...
error:
… while evaluating the attribute 'config'
at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:9:
321| options = checked options;
322| config = checked (removeAttrs config [ "_module" ]);
| ^
323| _module = checked (config._module);
… while calling the 'seq' builtin
at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:18:
321| options = checked options;
322| config = checked (removeAttrs config [ "_module" ]);
| ^
323| _module = checked (config._module);
(stack trace truncated; use '--show-trace' to show the full trace)
error: syntax error, unexpected '{', expecting '.' or '='
at /etc/nixos/configuration.nix:181:16:
180|
181| pcm.T6_capture {
| ^
182| type dsnoop
building the system configuration...
error:
… while evaluating the attribute 'config.system.build.toplevel'
at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:9:
321| options = checked options;
322| config = checked (removeAttrs config [ "_module" ]);
| ^
323| _module = checked (config._module);
… while calling the 'seq' builtin
at /nix/var/nix/profiles/per-user/root/channels/nixos/lib/modules.nix:322:18:
321| options = checked options;
322| config = checked (removeAttrs config [ "_module" ]);
| ^
323| _module = checked (config._module);
(stack trace truncated; use '--show-trace' to show the full trace)
error: syntax error, unexpected '{', expecting '.' or '='
at /etc/nixos/configuration.nix:181:16:
180|
181| pcm.T6_capture {
| ^
182| type dsnoop
I can’t seem to find a manual or any instructions on how to use sound.extraConfig, but I do see it here: NixOS Search