diff --git a/hardware/printer/discover.nix b/hardware/printer/discover.nix
new file mode 100644
index 0000000..2ffddf0
--- /dev/null
+++ b/hardware/printer/discover.nix
@@ -0,0 +1,20 @@
+{ lib, pkgs, ... }:
+{
+
+  # airprint
+  # https://wiki.nixos.org/wiki/Printing#Printer_sharing
+
+  services.avahi = {
+    enable = lib.mkDefault true;
+    nssmdns = true;
+    openFirewall = true; # opens UDP port 5353
+  };
+  services.printing = {
+    enable = lib.mkDefault true;
+    drivers = [
+      pkgs.cups-filters
+      pkgs.cups-browsed
+    ];
+  };
+
+}
diff --git a/hardware/printer/hp-laserjet-p1005.nix b/hardware/printer/hp-laserjet-p1005.nix
index eee31ee..8cac8c1 100644
--- a/hardware/printer/hp-laserjet-p1005.nix
+++ b/hardware/printer/hp-laserjet-p1005.nix
@@ -1,25 +1,25 @@
 { lib, pkgs, ... }:
 {
-  imports = [
-    ./common-share.nix
-  ];
+  # imports = [ ./share.nix ]; # up to the host to opt-in to
 
   # https://wiki.nixos.org/wiki/Printing
-  services.printing.enable = true;
+  services.printing.enable = lib.mkDefault true;
   #services.printing.drivers = with pkgs; [ foo2zjs foomatic-filters cups-filters ];
   #services.printing.drivers = with pkgs; [ foo2zjs hplip foomatic-filters cups-filters ];
   services.printing.drivers = with pkgs; [ foo2zjs hplipWithPlugin foomatic-filters cups-filters ];
   #services.printing.drivers = with pkgs; [ hplipWithPlugin cups-filters ];
 
-  #hardware.printers.ensureDefaultPrinter = lib.mkDefault "HP_LaserJet_P1005";
-  hardware.printers.ensurePrinters = lib.singleton {
-    name = "HP_LaserJet_P1005";
-    deviceUri = "hp:/usb/HP_LaserJet_P1005?serial=BC0CAEQ"; # `lpstat -s` # hplip
-    #deviceUri = "usb://HP/LaserJet%20P1005?serial=BC0CAEQ"; # `lpstat -s` # foo2zjs
-    model = "HP-LaserJet_P1005.ppd.gz"; # `lpinfo -m` # foo2zjs
-    #location = "";
-    description = "Laser printer";
-    ppdOptions.PageSize = "A4";
+  hardware.printers = {
+    ensureDefaultPrinter = lib.mkDefault "HP_LaserJet_P1005";
+    ensurePrinters = lib.singleton {
+      name = "HP_LaserJet_P1005";
+      deviceUri = "hp:/usb/HP_LaserJet_P1005?serial=BC0CAEQ"; # `lpstat -s` # hplip
+      # deviceUri = "usb://HP/LaserJet%20P1005?serial=BC0CAEQ"; # `lpstat -s` # foo2zjs
+      model = "HP-LaserJet_P1005.ppd.gz"; # `lpinfo -m` # foo2zjs
+      #location = "";
+      description = "Laser printer";
+      ppdOptions.PageSize = "A4";
+    };
   };
 
   services.printing.logLevel = "debug";
diff --git a/hardware/printer/common-share.nix b/hardware/printer/share.nix
similarity index 95%
rename from hardware/printer/common-share.nix
rename to hardware/printer/share.nix
index fd569c6..0c16b11 100644
--- a/hardware/printer/common-share.nix
+++ b/hardware/printer/share.nix
@@ -1,13 +1,15 @@
 { lib, pkgs, ... }:
 {
 
-  # airprint
+  # https://wiki.archlinux.org/title/CUPS/Printer_sharing
+
   # https://wiki.nixos.org/wiki/Printing#Printer_sharing
 
   services.avahi = {
     enable = lib.mkDefault true;
     nssmdns = true;
     openFirewall = true; # opens port 5353
+
     publish.enable = true;
     publish.userServices = true;
   };
diff --git a/hosts/nixos/nord/configuration.nix b/hosts/nixos/nord/configuration.nix
index d7005a9..539e13f 100644
--- a/hosts/nixos/nord/configuration.nix
+++ b/hosts/nixos/nord/configuration.nix
@@ -27,6 +27,7 @@
     inputs.nixos-hardware.nixosModules.common-gpu-intel-sandy-bridge
     ../../../hardware/gpu/rocm.nix
     ../../../hardware/gpu/zluda.nix
+    ../../../hardware/printer/discover.nix
     ../../../profiles/hidpi.nix
 
     ../../../profiles/nix-ld.nix
diff --git a/hosts/nixos/sopp/configuration.nix b/hosts/nixos/sopp/configuration.nix
index fe6d9f1..fa18b9f 100644
--- a/hosts/nixos/sopp/configuration.nix
+++ b/hosts/nixos/sopp/configuration.nix
@@ -51,7 +51,7 @@
     ../../../hardware/gpu/intel.nix
     ../../../hardware/gpu/cuda.nix
     ../../../hardware/printer/hp-laserjet-p1005.nix
-
+    ../../../hardware/printer/share.nix
 
     ../../../profiles/nix-ld.nix
     ../../../profiles/sshd
diff --git a/profiles/base/default.nix b/profiles/base/default.nix
index 49c9b13..d37206a 100644
--- a/profiles/base/default.nix
+++ b/profiles/base/default.nix
@@ -13,7 +13,7 @@
     ./vm-variant.nix
     ./ccache
     ./../mounts/common-nfs.nix
-    /* ./profiles/mounts/common-zfs.nix */
+    # ./profiles/mounts/common-zfs.nix
   ];
 
   nixpkgs.overlays = [
diff --git a/profiles/desktop/sound/pipewire.nix b/profiles/desktop/sound/pipewire.nix
index b73508c..9ff8411 100644
--- a/profiles/desktop/sound/pipewire.nix
+++ b/profiles/desktop/sound/pipewire.nix
@@ -1,26 +1,29 @@
-{ pkgs, ... }:
+{ config, pkgs, ... }:
+
+# https://wiki.nixos.org/wiki/PipeWire
+
 {
   services.pulseaudio.enable = false; # gnome defaults it to true
 
-  #sound.enable = true # alsa? likely conflicts with pipewire
-  #sound.mediaKeys.enable = true # alsa? only enable if headless
-  services.pipewire.enable = true;
-  services.pipewire.alsa.enable = true;
-  services.pipewire.alsa.support32Bit = true;
-  #services.pipewire.jack.enable = true;
-  services.pipewire.pulse.enable = true;
+  services.pipewire = {
+    enable = true;
+
+    alsa.enable = true;
+    alsa.support32Bit = true;
+
+    pulse.enable = true;
+
+    jack.enable = true;
+  };
 
-  # use the example session manager (no others are packaged yet so this is enabled by default,
-  # no need to redefine it in your config for now)
-  #services.pipewire.media-session.enable = true;
 
   environment.systemPackages = with pkgs; [
     pavucontrol # volume and defaults
     easyeffects # eq
     helvum      # patchbay
-    # carla       # VST (TODO: move into a DAW profile?) # TODO: build broken
+    # carla       # VST patchbay (TODO: move into a DAW profile? Can be used for midi) # TODO: build broken
   ];
 
   # optional, allows Pipewire to use the realtime scheduler for increased performance.
-  security.rtkit.enable = true;
+  security.rtkit.enable = config.services.pipewire.jack.enable;
 }
diff --git a/profiles/hidpi.nix b/profiles/hidpi.nix
index 8d51552..47e2669 100644
--- a/profiles/hidpi.nix
+++ b/profiles/hidpi.nix
@@ -1,6 +1,7 @@
 { inputs, ... }:
 {
   imports = [
+    # https://github.com/NixOS/nixos-hardware/blob/master/common/hidpi.nix
     inputs.nixos-hardware.nixosModules.common-hidpi
   ];
 
@@ -10,5 +11,14 @@
     # via
     # https://github.com/samemrecebi
     FREETYPE_PROPERTIES = "cff:no-stem-darkening=0 autofitter:no-stem-darkening=0";
+
+    # TODO: enable these?
+
+    # # https://wiki.archlinux.org/title/HiDPI#Qt_5
+    # QT_AUTO_SCREEN_SCALE_FACTOR = 1;
+    # QT_ENABLE_HIGHDPI_SCALING = 1;
+
+    # # https://wiki.archlinux.org/title/HiDPI#GDK_3_(GTK_3)
+    # GDK_SCALE = 2;
   };
 }