Lots of base board changes.

hardware/base/HackAmp-Symbols.kicad_sym

-(kicad_symbol_lib (version 20201005) (generator kicad_symbol_editor)
+(kicad_symbol_lib (version 20211014) (generator kicad_symbol_editor)
   (symbol "HackAmp-Symbols:AudioJack4_Ground_IsolatedSwitch" (in_bom yes) (on_board yes)
     (property "Reference" "J" (id 0) (at 0 11.43 0)
       (effects (font (size 1.27 1.27)))
     )
     (symbol "AudioJack4_Ground_IsolatedSwitch_0_1"
       (rectangle (start -7.62 -2.54) (end -8.89 -5.08)
-        (stroke (width 0.254)) (fill (type outline))
+        (stroke (width 0.254) (type default) (color 0 0 0 0))
+        (fill (type outline))
       )
       (rectangle (start -7.62 6.35) (end 3.81 -10.16)
-        (stroke (width 0.254)) (fill (type background))
+        (stroke (width 0.254) (type default) (color 0 0 0 0))
+        (fill (type background))
       )
       (polyline
         (pts
           (xy 1.905 -5.08)
           (xy 1.905 -4.826)
         )
-        (stroke (width 0.001)) (fill (type none))
+        (stroke (width 0.001) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 1.905 -4.445)
           (xy 1.905 -4.064)
         )
-        (stroke (width 0.001)) (fill (type none))
+        (stroke (width 0.001) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 1.905 -3.683)
           (xy 1.905 -3.302)
         )
-        (stroke (width 0.001)) (fill (type none))
+        (stroke (width 0.001) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 1.905 -2.921)
           (xy 1.905 -2.54)
         )
-        (stroke (width 0.001)) (fill (type none))
+        (stroke (width 0.001) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 2.286 -5.08)
           (xy 2.286 -4.826)
         )
-        (stroke (width 0.001)) (fill (type none))
+        (stroke (width 0.001) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 2.286 -4.445)
           (xy 2.286 -4.064)
         )
-        (stroke (width 0.001)) (fill (type none))
+        (stroke (width 0.001) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 2.286 -3.683)
           (xy 2.286 -3.302)
         )
-        (stroke (width 0.001)) (fill (type none))
+        (stroke (width 0.001) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 2.286 -2.921)
           (xy 2.286 -2.54)
         )
-        (stroke (width 0.001)) (fill (type none))
+        (stroke (width 0.001) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 3.81 2.54)
           (xy 5.08 2.54)
         )
-        (stroke (width 0)) (fill (type none))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 5.08 -5.08)
           (xy 1.905 -5.08)
         )
-        (stroke (width 0)) (fill (type none))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 5.08 -2.54)
           (xy 3.81 -2.54)
         )
-        (stroke (width 0)) (fill (type none))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 5.08 0)
           (xy 3.81 0)
         )
-        (stroke (width 0)) (fill (type none))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 5.08 5.08)
           (xy 3.81 5.08)
         )
-        (stroke (width 0)) (fill (type none))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
     )
     (symbol "AudioJack4_Ground_IsolatedSwitch_1_1"
           (xy 3.048 -5.334)
           (xy 3.302 -5.842)
         )
-        (stroke (width 0)) (fill (type none))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 0 -2.54)
           (xy 3.81 -2.54)
         )
-        (stroke (width 0.254)) (fill (type none))
+        (stroke (width 0.254) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy 3.048 -5.334)
           (xy 2.794 -5.842)
         )
-        (stroke (width 0)) (fill (type none))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy -1.905 0)
           (xy 3.81 0)
         )
-        (stroke (width 0.254)) (fill (type none))
+        (stroke (width 0.254) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy -4.445 -3.175)
           (xy -5.08 -2.54)
         )
-        (stroke (width 0.254)) (fill (type none))
+        (stroke (width 0.254) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (polyline
         (pts
           (xy -6.35 -3.175)
           (xy -6.985 -2.54)
         )
-        (stroke (width 0.254)) (fill (type none))
+        (stroke (width 0.254) (type default) (color 0 0 0 0))
+        (fill (type none))
       )
       (pin passive line (at 0 -12.7 90) (length 2.54)
         (name "~" (effects (font (size 1.27 1.27))))
     )
     (symbol "CSR-A64215-MOD_0_1"
       (rectangle (start -17.78 38.1) (end 17.78 -35.56)
-        (stroke (width 0)) (fill (type background))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type background))
       )
     )
     (symbol "CSR-A64215-MOD_1_1"
         (number "11" (effects (font (size 1.27 1.27))))
       )
       (pin input line (at 20.32 30.48 180) (length 2.54)
-        (name "~RST" (effects (font (size 1.27 1.27))))
+        (name "~{RST}" (effects (font (size 1.27 1.27))))
         (number "12" (effects (font (size 1.27 1.27))))
       )
       (pin power_in line (at -20.32 27.94 0) (length 2.54)
         (number "6" (effects (font (size 1.27 1.27))))
       )
       (pin input line (at -20.32 -33.02 0) (length 2.54)
-        (name "SPI/~PCM" (effects (font (size 1.27 1.27))))
+        (name "SPI/~{PCM}" (effects (font (size 1.27 1.27))))
         (number "7" (effects (font (size 1.27 1.27))))
       )
       (pin bidirectional line (at -20.32 12.7 0) (length 2.54)
       )
     )
   )
+  (symbol "HackAmp-Symbols:PCM1808" (in_bom yes) (on_board yes)
+    (property "Reference" "U" (id 0) (at -7.62 11.43 0)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Value" "PCM1808" (id 1) (at 8.89 11.43 0)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Footprint" "Package_SO:TSSOP-14_4.4x5mm_P0.65mm" (id 2) (at 0 0 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "https://www.ti.com/lit/ds/symlink/pcm1808.pdf?ts=1635537770052&ref_url=https%253A%252F%252Fwww.google.com%252F" (id 3) (at 0 0 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "ki_description" "PCM1808 Single-Ended, Analog-Input 24-Bit, 96-kHz Stereo ADC" (id 4) (at 0 0 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (symbol "PCM1808_0_1"
+      (rectangle (start -10.16 10.16) (end 10.16 -10.16)
+        (stroke (width 0.1524) (type default) (color 0 0 0 0))
+        (fill (type background))
+      )
+    )
+    (symbol "PCM1808_1_1"
+      (pin power_out line (at 12.7 -2.54 180) (length 2.54)
+        (name "VREF" (effects (font (size 1.27 1.27))))
+        (number "1" (effects (font (size 1.27 1.27))))
+      )
+      (pin input line (at -12.7 -5.08 0) (length 2.54)
+        (name "MD0" (effects (font (size 1.27 1.27))))
+        (number "10" (effects (font (size 1.27 1.27))))
+      )
+      (pin input line (at -12.7 -7.62 0) (length 2.54)
+        (name "MD1" (effects (font (size 1.27 1.27))))
+        (number "11" (effects (font (size 1.27 1.27))))
+      )
+      (pin input line (at 12.7 2.54 180) (length 2.54)
+        (name "VINL" (effects (font (size 1.27 1.27))))
+        (number "13" (effects (font (size 1.27 1.27))))
+      )
+      (pin input line (at 12.7 5.08 180) (length 2.54)
+        (name "VINR" (effects (font (size 1.27 1.27))))
+        (number "14" (effects (font (size 1.27 1.27))))
+      )
+      (pin power_in line (at -2.54 -12.7 90) (length 2.54)
+        (name "AGND" (effects (font (size 1.27 1.27))))
+        (number "2" (effects (font (size 1.27 1.27))))
+      )
+      (pin power_in line (at 2.54 12.7 270) (length 2.54)
+        (name "VCC" (effects (font (size 1.27 1.27))))
+        (number "3" (effects (font (size 1.27 1.27))))
+      )
+      (pin power_in line (at -2.54 12.7 270) (length 2.54)
+        (name "VDD" (effects (font (size 1.27 1.27))))
+        (number "4" (effects (font (size 1.27 1.27))))
+      )
+      (pin power_in line (at 2.54 -12.7 90) (length 2.54)
+        (name "DGND" (effects (font (size 1.27 1.27))))
+        (number "5" (effects (font (size 1.27 1.27))))
+      )
+      (pin bidirectional line (at -12.7 5.08 0) (length 2.54)
+        (name "LRCK" (effects (font (size 1.27 1.27))))
+        (number "7" (effects (font (size 1.27 1.27))))
+      )
+      (pin input line (at -12.7 7.62 0) (length 2.54)
+        (name "SCKI" (effects (font (size 1.27 1.27))))
+        (number "7" (effects (font (size 1.27 1.27))))
+      )
+      (pin bidirectional line (at -12.7 2.54 0) (length 2.54)
+        (name "BCK" (effects (font (size 1.27 1.27))))
+        (number "8" (effects (font (size 1.27 1.27))))
+      )
+      (pin output line (at -12.7 0 0) (length 2.54)
+        (name "DOUT" (effects (font (size 1.27 1.27))))
+        (number "9" (effects (font (size 1.27 1.27))))
+      )
+    )
+  )
   (symbol "HackAmp-Symbols:TAS5760M" (pin_names (offset 1.016)) (in_bom yes) (on_board yes)
     (property "Reference" "U" (id 0) (at -7.62 31.75 0)
       (effects (font (size 1.524 1.524)))
     )
     (symbol "TAS5760M_1_1"
       (rectangle (start -15.24 -30.48) (end 15.24 30.48)
-        (stroke (width 0)) (fill (type background))
+        (stroke (width 0) (type default) (color 0 0 0 0))
+        (fill (type background))
       )
       (pin power_in line (at 22.86 27.94 180) (length 7.62)
         (name "AVDD" (effects (font (size 1.27 1.27))))
         (number "5" (effects (font (size 1.27 1.27))))
       )
       (pin output line (at -22.86 5.08 0) (length 7.62)
-        (name "~SPK_FAULT" (effects (font (size 1.27 1.27))))
+        (name "~{SPK_FAULT}" (effects (font (size 1.27 1.27))))
         (number "6" (effects (font (size 1.27 1.27))))
       )
       (pin output line (at -22.86 2.54 0) (length 7.62)
-        (name "~SPK_SD" (effects (font (size 1.27 1.27))))
+        (name "~{SPK_SD}" (effects (font (size 1.27 1.27))))
         (number "7" (effects (font (size 1.27 1.27))))
       )
       (pin input line (at -22.86 -2.54 0) (length 7.62)
     )
     (symbol "TAS5760M-Module_0_1"
       (rectangle (start -13.97 17.78) (end 12.7 -17.78)
-        (stroke (width 0.1524)) (fill (type background))
+        (stroke (width 0.1524) (type default) (color 0 0 0 0))
+        (fill (type background))
       )
     )
     (symbol "TAS5760M-Module_1_1"
         (number "19" (effects (font (size 1.27 1.27))))
       )
       (pin output line (at -16.51 5.08 0) (length 2.54)
-        (name "~SPK_FAULT" (effects (font (size 1.27 1.27))))
+        (name "~{SPK_FAULT}" (effects (font (size 1.27 1.27))))
         (number "2" (effects (font (size 1.27 1.27))))
       )
       (pin power_in line (at 2.54 -20.32 90) (length 2.54)
         (number "23" (effects (font (size 1.27 1.27))))
       )
       (pin output line (at -16.51 2.54 0) (length 2.54)
-        (name "~SPK_SD" (effects (font (size 1.27 1.27))))
+        (name "~{SPK_SD}" (effects (font (size 1.27 1.27))))
         (number "3" (effects (font (size 1.27 1.27))))
       )
       (pin bidirectional line (at -16.51 12.7 0) (length 2.54)
     )
     (symbol "WM8731-Module_0_1"
       (rectangle (start -7.62 12.7) (end 7.62 -12.7)
-        (stroke (width 0.1524)) (fill (type background))
+        (stroke (width 0.1524) (type default) (color 0 0 0 0))
+        (fill (type background))
       )
     )
     (symbol "WM8731-Module_1_1"
         (number "11" (effects (font (size 1.27 1.27))))
       )
       (pin output line (at -10.16 -5.08 0) (length 2.54)
-        (name "~CONN" (effects (font (size 1.27 1.27))))
+        (name "~{CONN}" (effects (font (size 1.27 1.27))))
         (number "12" (effects (font (size 1.27 1.27))))
       )
       (pin power_in line (at 0 -15.24 90) (length 2.54)

hardware/base/base.kicad_pro

         "drill_out_of_range": "error",
         "duplicate_footprints": "warning",
         "extra_footprint": "warning",
+        "footprint_type_mismatch": "error",
         "hole_clearance": "error",
         "hole_near_hole": "error",
         "invalid_outline": "error",
         "silk_over_copper": "error",
         "silk_overlap": "error",
         "skew_out_of_range": "error",
+        "through_hole_pad_without_hole": "error",
         "too_many_vias": "error",
         "track_dangling": "warning",
         "track_width": "error",
     [
       "00000000-0000-0000-0000-00005fb71226",
       "Front"
+    ],
+    [
+      "bae9ff6d-7b10-4099-9c51-b92b6161b62a",
+      "Line-In + SPDIF"
     ]
   ],
   "text_variables": {}

hardware/base/base.kicad_sch

             (xy -1.524 -0.508)
             (xy 1.524 -0.508)
           )
-          (stroke (width 0.3302)) (fill (type none))
+          (stroke (width 0.3302) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
         (polyline
           (pts
             (xy -1.524 0.508)
             (xy 1.524 0.508)
           )
-          (stroke (width 0.3048)) (fill (type none))
+          (stroke (width 0.3048) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
       )
       (symbol "C_Small_1_1"
       )
       (symbol "R_0_1"
         (rectangle (start -1.016 -2.54) (end 1.016 2.54)
-          (stroke (width 0.254)) (fill (type none))
+          (stroke (width 0.254) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
       )
       (symbol "R_1_1"
         (effects (font (size 1.27 1.27)) hide)
       )
       (symbol "MountingHole_Pad_0_1"
-        (circle (center 0 1.27) (radius 1.27) (stroke (width 1.27)) (fill (type none)))
+        (circle (center 0 1.27) (radius 1.27) (stroke (width 1.27))           (stroke (width 1.27) (type default) (color 0 0 0 0))
+          (fill (type none))
+        )
       )
       (symbol "MountingHole_Pad_1_1"
         (pin input line (at 0 -2.54 90) (length 2.54)
         (effects (font (size 1.27 1.27)) hide)
       )
       (symbol "SW_Push_0_1"
-        (circle (center -2.032 0) (radius 0.508) (stroke (width 0)) (fill (type none)))
-        (circle (center 2.032 0) (radius 0.508) (stroke (width 0)) (fill (type none)))
+        (circle (center -2.032 0) (radius 0.508) (stroke (width 0))           (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
+        )
         (polyline
           (pts
             (xy 0 1.27)
             (xy 0 3.048)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
         (polyline
           (pts
             (xy 2.54 1.27)
             (xy -2.54 1.27)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
+        )
+        (circle (center 2.032 0) (radius 0.508) (stroke (width 0))           (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
         (pin passive line (at -5.08 0 0) (length 2.54)
           (name "1" (effects (font (size 1.27 1.27))))
             (xy -0.762 1.27)
             (xy 0 2.54)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
         (polyline
           (pts
             (xy 0 0)
             (xy 0 2.54)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
         (polyline
           (pts
             (xy 0 2.54)
             (xy 0.762 1.27)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
       )
       (symbol "+3.3V_1_1"
             (xy -0.762 1.27)
             (xy 0 2.54)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
         (polyline
           (pts
             (xy 0 0)
             (xy 0 2.54)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
         (polyline
           (pts
             (xy 0 2.54)
             (xy 0.762 1.27)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
       )
       (symbol "+3V3_1_1"
             (xy -1.27 -1.27)
             (xy 0 -1.27)
           )
-          (stroke (width 0)) (fill (type none))
+          (stroke (width 0) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
       )
       (symbol "GND_1_1"
     )
   )
 
+  (sheet (at 22.86 78.74) (size 30.48 31.75) (fields_autoplaced)
+    (stroke (width 0.1524) (type solid) (color 132 0 132 1))
+    (fill (color 255 255 255 0.0000))
+    (uuid bae9ff6d-7b10-4099-9c51-b92b6161b62a)
+    (property "Schaltplanname" "Line-In + SPDIF" (id 0) (at 22.86 78.0284 0)
+      (effects (font (size 1.27 1.27)) (justify left bottom))
+    )
+    (property "Dateiname Blatt" "linein.kicad_sch" (id 1) (at 22.86 111.0746 0)
+      (effects (font (size 1.27 1.27)) (justify left top))
+    )
+  )
+
   (sheet (at 21.59 24.13) (size 30.48 5.08)
     (stroke (width 0) (type solid) (color 0 0 0 0))
     (fill (color 0 0 0 0.0000))
     (path "/00000000-0000-0000-0000-00005fa5bd7a" (page "5"))
     (path "/fe79bf95-febd-4d06-8fbd-8e75ad92e186" (page "6"))
     (path "/00000000-0000-0000-0000-00005fb71226" (page "7"))
+    (path "/bae9ff6d-7b10-4099-9c51-b92b6161b62a" (page "7"))
   )
 
   (symbol_instances
     (path "/fe79bf95-febd-4d06-8fbd-8e75ad92e186/3d4947cf-ab65-4926-8320-ac39e05278fa"
       (reference "U8") (unit 1) (value "RP2040") (footprint "MCU_RaspberryPi_and_Boards:RP2040-QFN-56")
     )
+    (path "/bae9ff6d-7b10-4099-9c51-b92b6161b62a/c361644a-5a63-4b93-a433-0995be6d8ac9"
+      (reference "U9") (unit 1) (value "PCM1808") (footprint "Package_SO:TSSOP-14_4.4x5mm_P0.65mm")
+    )
     (path "/00000000-0000-0000-0000-00005fa5bd7a/1a276aa6-b113-4617-8385-287d58f1fd14"
       (reference "Y1") (unit 1) (value "12MHz") (footprint "Crystal:Crystal_SMD_EuroQuartz_MT-4Pin_3.2x2.5mm")
     )

hardware/base/front.kicad_sch

             (xy -2.032 -0.762)
             (xy 2.032 -0.762)
           )
-          (stroke (width 0.508)) (fill (type none))
+          (stroke (width 0.508) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
         (polyline
           (pts
             (xy -2.032 0.762)
             (xy 2.032 0.762)
           )
-          (stroke (width 0.508)) (fill (type none))
+          (stroke (width 0.508) (type default) (color 0 0 0 0))
+          (fill (type none))
         )
       )
       (symbol "C_1_1"
       )
       (symbol "R_0_1"
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