diff --git a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital.cam b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital.cam
deleted file mode 100644
index 2b999ce..0000000
--- a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital.cam
+++ /dev/null
@@ -1,284 +0,0 @@
-{
- "author": {
- "email": "jh.bruhn@me.com",
- "name": "Jan-Henrik Bruhn"
- },
- "description": {
- "EN": "EAGLE default 2 layer CAM job."
- },
- "output_type": "zip",
- "outputs": [
- {
- "filename_prefix": "CAMOutputs/GerberFiles",
- "format_specifier": {
- "decimal": 4,
- "integer": 3
- },
- "generate_job_file": true,
- "output_type": "gerber",
- "outputs": [
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": false,
- "config": {
- "file_function": "Copper",
- "layer": 1,
- "layer_details": "mixed",
- "layer_type": "top"
- },
- "filename_format": "%PREFIX/copper_top.gbr",
- "layers": [
- 1,
- 17,
- 18
- ],
- "name": "Top Copper",
- "polarity": "positive",
- "type": "gerber_layer"
- },
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": false,
- "config": {
- "file_function": "Copper",
- "layer": 2,
- "layer_details": "mixed",
- "layer_type": "bottom"
- },
- "filename_format": "%PREFIX/copper_bottom.gbr",
- "layers": [
- 16,
- 17,
- 18
- ],
- "name": "Bottom Copper",
- "polarity": "positive",
- "type": "gerber_layer"
- },
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": true,
- "config": {
- "file_function": "Profile",
- "plating": "non-plated"
- },
- "filename_format": "%PREFIX/profile.gbr",
- "layers": [
- ],
- "milling": true,
- "polarity": "positive",
- "type": "gerber_layer"
- },
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": false,
- "config": {
- "file_function": "Soldermask",
- "index": 1,
- "layer_type": "top"
- },
- "filename_format": "%PREFIX/soldermask_top.gbr",
- "layers": [
- 29
- ],
- "name": "Soldermask Top",
- "polarity": "positive",
- "type": "gerber_layer"
- },
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": false,
- "config": {
- "file_function": "Soldermask",
- "index": 1,
- "layer_type": "bottom"
- },
- "filename_format": "%PREFIX/soldermask_bottom.gbr",
- "layers": [
- 30
- ],
- "name": "Soldermask Bottom",
- "polarity": "positive",
- "type": "gerber_layer"
- },
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": false,
- "config": {
- "file_function": "Paste",
- "layer_type": "top"
- },
- "filename_format": "%PREFIX/solderpaste_top.gbr",
- "layers": [
- 31
- ],
- "milling": false,
- "name": "Solderpaste Top",
- "polarity": "positive",
- "type": "gerber_layer"
- },
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": false,
- "config": {
- "file_function": "Paste",
- "layer_type": "bottom"
- },
- "filename_format": "%PREFIX/solderpaste_bottom.gbr",
- "layers": [
- 32
- ],
- "milling": false,
- "name": "Solderpaste Bottom",
- "polarity": "positive",
- "type": "gerber_layer"
- },
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": false,
- "config": {
- "file_function": "Legend",
- "index": 1,
- "layer_type": "top"
- },
- "filename_format": "%PREFIX/silkscreen_top.gbr",
- "layers": [
- 21,
- 25,
- 51
- ],
- "milling": false,
- "name": "Silkscreen Top",
- "polarity": "positive",
- "type": "gerber_layer"
- },
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "board_outline": false,
- "config": {
- "file_function": "Legend",
- "index": 1,
- "layer_type": "bottom"
- },
- "filename_format": "%PREFIX/silkscreen_bottom.gbr",
- "layers": [
- 22,
- 26,
- 52
- ],
- "milling": false,
- "name": "Silkscreen Bottom",
- "polarity": "positive",
- "type": "gerber_layer"
- }
- ],
- "version": "RS274X"
- },
- {
- "filename_prefix": "CAMOutputs/DrillFiles",
- "format_specifier": {
- "decimal": 3,
- "integer": 3
- },
- "output_type": "drill",
- "outputs": [
- {
- "advanced_options": {
- "mirror": false,
- "offset_x": 0,
- "offset_y": 0,
- "rotate": false,
- "upside_down": false
- },
- "filename_format": "%DRILLPREFIX/drill_%FROM_%TO.xln",
- "name": "Auto Drill",
- "type": "autodrills"
- }
- ]
- },
- {
- "filename_prefix": "CAMOutputs/Assembly",
- "output_type": "assembly",
- "outputs": [
- {
- "filename_format": "%ASSEMBLYPREFIX/%N",
- "list_attribute": true,
- "list_type": "values",
- "name": "Bill of Material",
- "output_format": "txt",
- "type": "bom"
- },
- {
- "filename_format": "%ASSEMBLYPREFIX/PnP_%N_%BOARDSIDE",
- "name": "Pick and Place",
- "output_format": "txt",
- "type": "pick_and_place"
- }
- ]
- },
- {
- "filename_prefix": "CAMOutputs/DrawingFiles",
- "output_type": "drawing",
- "outputs": [
- ]
- }
- ],
- "timestamp": "2020-03-13T11:03:29",
- "type": "EAGLE CAM job",
- "units": "metric",
- "version": "9.2.0"
-}
diff --git a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_2020-03-12.zip b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_2020-03-12.zip
deleted file mode 100644
index 09ae0df..0000000
Binary files a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_2020-03-12.zip and /dev/null differ
diff --git a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_2020-04-04.zip b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_2020-04-04.zip
new file mode 100644
index 0000000..e067672
Binary files /dev/null and b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_2020-04-04.zip differ
diff --git a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_bottom_bom.csv b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_bottom_bom.csv
new file mode 100644
index 0000000..7a9f516
--- /dev/null
+++ b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_bottom_bom.csv
@@ -0,0 +1,30 @@
+Comment,Designator,Footprint,LCSC Part #
+1k,R95 R96,R0402,
+4.7nF,C19 C20 C21 C22,C0402,
+8MHz,X1,NX5032,
+10k,R85,R0402,
+10uF,C37 C38 C39 C41,CASE-A_3216,
+10uF,C49 C50 C51 C52 C53 C54 C55 C56,C0402,
+10uF,C65 C66,CASE-A_3216,
+15k,R9 R10 R11 R12 R41 R42 R43 R44,R0402,
+22pF,C26 C27,C0402,
+22uF,C47 C48,C0805,
+33k,R73 R74 R75 R76,R0402,
+47k,R13 R14 R15 R16 R17 R18 R19 R20 R45 R46 R47 R48 R49 R50 R51 R52,R0402,
+91k,R1 R3 R5 R7 R33 R35 R37 R39,R0402,
+100R,R91 R92 R93 R94,R0402,
+100k,R2 R4 R6 R8 R21 R22 R24 R27 R29 R30 R31 R32 R34 R36 R38 R40 R53 R54 R55 R56 R61 R62 R63 R64 R66 R68 R70 R72 R81 R82 R83 R84 R88 R89,R0402,
+100nF,C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C23 C24 C25 C28 C29 C30 C31 C34 C35 C40 C42 C43 C44 C45 C46 C57 C58 C59 C60 C61 C62 C63 C64,C0402,
+200k,R65 R67 R69 R71 R77 R78 R79 R80,R0402,
+220pF,C32 C33,C0402,
+300k,R23 R25 R26 R28 R57 R58 R59 R60,R0402,
+470R,R90,R0402,
+4051CD4051,IC1,SOIC16N,
+AMS1117-3.3,IC2,SOT223,
+B5819W,D1 D2,SOD123,
+LM4040AIM3-10.0,D3,SOT23,
+MCP4822E-SN,U1 U2 U9 U10,SOIC8,
+MCP4922E/SL,U5 U6 U13 U14,SO-14,
+MCP6002T-I/SN,U3 U4 U11 U12 U17 U18 U19 U20,SOIC8,
+STM32F030C8T6,U21,LQFP48,
+TL072CD,U7 U8 U15 U16 U22,SOIC8,
diff --git a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_bottom_cpl.csv b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_bottom_cpl.csv
new file mode 100644
index 0000000..abb1c79
--- /dev/null
+++ b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_back_digital_bottom_cpl.csv
@@ -0,0 +1,188 @@
+Designator,Mid X,Mid Y,Layer,Rotation
+C1,30.48,99.06,Bottom,180.0
+C2,41.27,94.62,Bottom,180.0
+C3,30.16,77.47,Bottom,180.0
+C4,40.96,73.03,Bottom,180.0
+C5,30.16,55.88,Bottom,180.0
+C6,40.96,29.85,Bottom,180.0
+C7,30.16,34.29,Bottom,180.0
+C8,40.96,51.44,Bottom,180.0
+C9, 3.18,88.58,Bottom,90.0
+C10, 3.18,66.99,Bottom,90.0
+C11, 3.18,45.40,Bottom,90.0
+C12, 3.18,23.50,Bottom,90.0
+C13,55.56,33.02,Bottom,0.0
+C14,62.87,55.25,Bottom,180.0
+C15,62.87,98.43,Bottom,180.0
+C16,62.87,76.84,Bottom,180.0
+C17,17.14,88.58,Bottom,90.0
+C18,17.14,66.99,Bottom,90.0
+C19,18.41,95.57,Bottom,90.0
+C20,18.41,73.98,Bottom,90.0
+C21,18.41,52.39,Bottom,90.0
+C22,18.41,30.48,Bottom,90.0
+C23,17.14,45.40,Bottom,90.0
+C24,17.14,23.81,Bottom,90.0
+C25,34.93, 4.45,Bottom,270.0
+C26,41.91, 1.27,Bottom,180.0
+C27,36.83, 1.27,Bottom,180.0
+C28,42.23, 6.67,Bottom,0.0
+C29,32.38,15.88,Bottom,180.0
+C30,43.50, 8.89,Bottom,90.0
+C31,57.79,37.47,Bottom,180.0
+C32,18.10,14.61,Bottom,0.0
+C33, 7.30,13.34,Bottom,0.0
+C34,14.61, 9.53,Bottom,0.0
+C35, 7.30,14.61,Bottom,180.0
+C37,58.42, 9.53,Bottom,180.0
+C38,25.40, 1.27,Bottom,180.0
+C39,58.42, 3.49,Bottom,180.0
+C40,20.32, 5.40,Bottom,180.0
+C41,45.40, 6.03,Bottom,270.0
+C42,45.40, 1.27,Bottom,180.0
+C43,55.56,84.77,Bottom,270.0
+C44,55.56,63.18,Bottom,270.0
+C45,55.56,41.59,Bottom,270.0
+C46,56.20,17.78,Bottom,270.0
+C47,29.21, 7.62,Bottom,270.0
+C48,58.42, 6.67,Bottom,0.0
+C49,54.29,84.77,Bottom,270.0
+C50,54.29,63.18,Bottom,270.0
+C51,54.29,41.59,Bottom,270.0
+C52,54.93,17.78,Bottom,270.0
+C53,57.79,98.43,Bottom,180.0
+C54,62.87,78.11,Bottom,180.0
+C55,62.87,56.52,Bottom,180.0
+C56,55.56,31.75,Bottom,0.0
+C57,59.69,85.09,Bottom,180.0
+C58,59.69,63.50,Bottom,180.0
+C59,59.69,41.91,Bottom,180.0
+C60,59.69,20.32,Bottom,180.0
+C61,38.10,85.09,Bottom,180.0
+C62,38.10,63.50,Bottom,180.0
+C63,38.10,41.91,Bottom,180.0
+C64,38.10,20.32,Bottom,180.0
+C65, 5.71, 2.54,Bottom,0.0
+C66,12.07, 2.54,Bottom,180.0
+D1,58.74,12.70,Bottom,0.0
+D2,31.12, 2.86,Bottom,180.0
+D3,20.32, 2.54,Bottom,0.0
+IC1,63.18,33.02,Bottom,270.0
+IC2,50.80, 3.81,Bottom,0.0
+R1, 6.99,95.25,Bottom,270.0
+R2, 5.71,95.25,Bottom,270.0
+R3, 6.99,85.09,Bottom,90.0
+R4, 8.26,85.09,Bottom,90.0
+R5, 6.99,73.66,Bottom,270.0
+R6, 5.71,73.66,Bottom,270.0
+R7, 6.99,63.50,Bottom,90.0
+R8, 8.26,63.50,Bottom,90.0
+R9, 4.45,95.25,Bottom,270.0
+R10, 5.71,85.09,Bottom,90.0
+R11, 4.45,73.66,Bottom,270.0
+R12, 5.71,63.50,Bottom,90.0
+R13,41.91,98.43,Bottom,180.0
+R14,29.85,97.16,Bottom,0.0
+R15,31.12,94.62,Bottom,0.0
+R16,40.64,97.16,Bottom,180.0
+R17,41.59,76.84,Bottom,180.0
+R18,29.53,75.56,Bottom,0.0
+R19,30.80,73.03,Bottom,0.0
+R20,40.32,75.56,Bottom,180.0
+R21,31.12,95.89,Bottom,0.0
+R22,30.80,74.30,Bottom,180.0
+R23,40.32,98.74,Bottom,90.0
+R24,40.64,95.89,Bottom,0.0
+R25,31.43,97.47,Bottom,90.0
+R26,40.01,77.15,Bottom,90.0
+R27,40.32,74.30,Bottom,0.0
+R28,31.12,75.88,Bottom,90.0
+R29,17.14,11.43,Bottom,270.0
+R30, 2.54, 9.53,Bottom,90.0
+R31,18.41,11.43,Bottom,270.0
+R32, 3.81, 9.53,Bottom,90.0
+R33, 6.99,52.07,Bottom,270.0
+R34, 5.71,52.07,Bottom,270.0
+R35, 6.99,41.91,Bottom,90.0
+R36, 8.26,41.91,Bottom,90.0
+R37, 6.99,30.48,Bottom,270.0
+R38, 5.71,30.48,Bottom,270.0
+R39, 6.99,20.32,Bottom,90.0
+R40, 8.26,20.32,Bottom,90.0
+R41, 4.45,52.07,Bottom,270.0
+R42, 5.71,41.91,Bottom,90.0
+R43, 4.45,30.48,Bottom,270.0
+R44, 5.71,20.32,Bottom,90.0
+R45,41.59,55.25,Bottom,180.0
+R46,29.53,53.98,Bottom,0.0
+R47,30.80,51.44,Bottom,0.0
+R48,41.59,33.66,Bottom,180.0
+R49,29.53,32.38,Bottom,0.0
+R50,30.80,29.85,Bottom,0.0
+R51,40.32,53.98,Bottom,180.0
+R52,40.32,32.38,Bottom,180.0
+R53,40.32,52.71,Bottom,180.0
+R54,30.80,52.71,Bottom,0.0
+R55,40.32,31.12,Bottom,180.0
+R56,30.80,31.12,Bottom,0.0
+R57,40.01,55.56,Bottom,90.0
+R58,40.01,33.97,Bottom,90.0
+R59,31.12,54.29,Bottom,90.0
+R60,31.12,32.70,Bottom,90.0
+R61,19.69,11.43,Bottom,270.0
+R62,20.96,11.43,Bottom,270.0
+R63, 5.08, 9.53,Bottom,90.0
+R64, 6.35, 9.53,Bottom,90.0
+R65,22.23,95.25,Bottom,270.0
+R66,20.96,95.25,Bottom,270.0
+R67,22.23,73.66,Bottom,270.0
+R68,20.96,73.66,Bottom,270.0
+R69,22.23,52.07,Bottom,270.0
+R70,20.96,52.07,Bottom,270.0
+R71,22.23,30.48,Bottom,270.0
+R72,20.96,30.48,Bottom,270.0
+R73,19.69,95.25,Bottom,90.0
+R74,19.69,73.66,Bottom,90.0
+R75,19.69,52.07,Bottom,90.0
+R76,19.69,30.48,Bottom,90.0
+R77,20.96,85.09,Bottom,270.0
+R78,20.96,63.50,Bottom,270.0
+R79,20.96,41.91,Bottom,270.0
+R80,20.96,20.32,Bottom,270.0
+R81,22.23,85.09,Bottom,90.0
+R82,22.23,63.50,Bottom,90.0
+R83,22.23,41.91,Bottom,90.0
+R84,22.23,20.32,Bottom,90.0
+R85,53.98, 8.26,Bottom,270.0
+R88,17.78,13.34,Bottom,0.0
+R89, 7.62,12.07,Bottom,0.0
+R90,23.50, 2.86,Bottom,0.0
+R91,49.53,79.06,Bottom,0.0
+R92,49.53,57.47,Bottom,0.0
+R93,49.53,35.88,Bottom,0.0
+R94,49.85,14.29,Bottom,0.0
+R95, 1.91, 2.54,Bottom,180.0
+R96,15.88, 2.54,Bottom,0.0
+U1,60.96,95.25,Bottom,270.0
+U2,60.96,73.66,Bottom,270.0
+U3, 6.35,90.17,Bottom,0.0
+U4, 6.35,68.58,Bottom,0.0
+U5,50.16,90.17,Bottom,180.0
+U6,50.16,68.58,Bottom,180.0
+U7,35.88,96.52,Bottom,270.0
+U8,35.56,74.93,Bottom,270.0
+U9,60.96,52.07,Bottom,270.0
+U10,50.16,30.48,Bottom,270.0
+U11, 6.35,46.99,Bottom,0.0
+U12, 6.35,25.40,Bottom,0.0
+U13,50.16,46.99,Bottom,180.0
+U14,50.16,22.86,Bottom,180.0
+U15,35.56,53.34,Bottom,270.0
+U16,35.56,31.75,Bottom,270.0
+U17,20.32,90.17,Bottom,0.0
+U18,20.32,68.58,Bottom,0.0
+U19,20.32,46.99,Bottom,0.0
+U20,20.32,25.40,Bottom,0.0
+U21,37.47,11.43,Bottom,180.0
+U22,12.70,12.70,Bottom,270.0
+X1,39.37, 3.81,Bottom,180.0
diff --git a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_bom.csv b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_bom.csv
deleted file mode 100644
index ee939a8..0000000
--- a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_bom.csv
+++ /dev/null
@@ -1,31 +0,0 @@
-"Comment","Designator","Footprint","LCSC Part #","LCSC Part Type"
-"","VR1, VR2, VR3, VR4, VR5, VR6, VR7, VR8","9MM_SNAP-IN_POT","",""
-"","JP1, JP2","JP2","",""
-"100k","R2, R4, R6, R8, R21, R22, R24, R27, R29, R30, R31, R32, R34, R36, R38, R40, R53, R54, R55, R56, R61, R62, R63, R64, R66, R68, R70, R72, R81, R82, R83, R84, R86, R87, R88, R89","0402_R","",""
-"100nF","C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C23, C24, C25, C28, C29, C30, C31, C34, C35, C40, C42","0402_C","",""
-"10k","R85","0402_R","",""
-"10uF","C37, C38, C39, C41","A/3216-18R","",""
-"15k","R9, R10, R11, R12, R41, R42, R43, R44","0402_R","",""
-"1N4148W","D1, D2","SOD123","",""
-"200k","R65, R67, R69, R71, R77, R78, R79, R80","0402_R","",""
-"22pF","C26, C27","0402_C","",""
-"300k","R23, R25, R26, R28, R57, R58, R59, R60","0402_R","",""
-"33k","R73, R74, R75, R76","0402_R","",""
-"4.7nF","C19, C20, C21, C22","0402_C","",""
-"4051D","IC1","SO16","",""
-"470R","R90","0402_R","",""
-"47k","R13, R14, R15, R16, R17, R18, R19, R20, R45, R46, R47, R48, R49, R50, R51, R52","0402_R","",""
-"6.8pF","C32, C33","0402_C","",""
-"8MHz","X1","NX5032","",""
-"91k","R1, R3, R5, R7, R33, R35, R37, R39","0402_R","",""
-"AMS1117-3.3","IC2","SOT223","",""
-"CORTEX_DEBUG_PTH","J17","2X5-PTH-1.27MM","",""
-"EURO_POWER_LOCKFAT-LOCK","C36","EURO_PWR_HEADER_LOCK","",""
-"LM4040AIM3-10.0","D3","SOT23","",""
-"MCP4822E-SN","U1, U2, U9, U10","SOIC8","",""
-"MCP4922E/SL","U5, U6, U13, U14","SO-14","",""
-"MCP6002T-I/SN","U3, U4, U11, U12, U17, U18, U19, U20","SOIC8","",""
-"OSHW-LOGOS","LOGO1","OSHW-LOGO-S","",""
-"STM32F030C8T6","U21","LQFP48","",""
-"TL072CD","U7, U8, U15, U16, U22","SOIC8","",""
-"WQP-PJ301M-12_JACK","J1, J2, J3, J4, J5, J6, J7, J8, J9, J10, J11, J12, J13, J14, J15, J16, J18, J19","WQP-PJ301M-12_JACK","",""
diff --git a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_cpl.csv b/stereo_mix/hardware_design/pcb/assembly/stereo_mix_cpl.csv
deleted file mode 100644
index 35c1e82..0000000
--- a/stereo_mix/hardware_design/pcb/assembly/stereo_mix_cpl.csv
+++ /dev/null
@@ -1,160 +0,0 @@
-"Designator","Mid X","Mid Y","Layer","Rotation"
-"C1","34.29","99.06","Bottom",0
-"C2","45.09","93.98","Bottom",0
-"C3","34.29","80.01","Bottom",0
-"C4","41.91","73.66","Bottom",0
-"C5","31.75","59.69","Bottom",180
-"C6","40.64","30.48","Bottom",0
-"C7","35.56","36.83","Bottom",180
-"C8","41.91","52.07","Bottom",0
-"C9","13.97","87.63","Bottom",180
-"C10","13.97","66.04","Bottom",180
-"C11","13.97","44.45","Bottom",180
-"C12","13.97","22.86","Bottom",180
-"C13","67.31","36.20","Bottom",180
-"C14","66.04","57.79","Bottom",180
-"C15","66.67","98.43","Bottom",180
-"C16","64.77","79.38","Bottom",180
-"C17","16.51","82.55","Bottom",90
-"C18","16.51","60.96","Bottom",90
-"C19","18.41","90.17","Bottom",90
-"C20","18.41","68.58","Bottom",90
-"C21","18.41","46.99","Bottom",90
-"C22","18.41","25.40","Bottom",90
-"C23","16.51","39.37","Bottom",90
-"C24","16.51","17.78","Bottom",90
-"C25","41.91","8.89","Bottom",270
-"C26","52.07","21.59","Bottom",0
-"C27","48.26","21.59","Bottom",180
-"C28","44.45","37.47","Bottom",270
-"C29","56.52","28.58","Bottom",180
-"C30","45.72","27.30","Bottom",0
-"C31","46.99","50.80","Bottom",0
-"C32","17.78","14.61","Bottom",180
-"C33","7.62","13.34","Bottom",180
-"C34","12.70","9.53","Bottom",180
-"C35","7.62","14.61","Bottom",0
-"C37","66.04","10.16","Bottom",0
-"C38","66.04","6.35","Bottom",180
-"C39","33.02","3.81","Bottom",90
-"C40","18.41","6.35","Bottom",90
-"C41","43.18","3.81","Bottom",270
-"C42","33.02","7.62","Bottom",0
-"D1","65.41","13.34","Bottom",180
-"D2","65.41","3.18","Bottom",0
-"D3","20.32","2.54","Bottom",180
-"IC1","50.16","58.42","Bottom",270
-"IC2","38.10","5.08","Bottom",270
-"R1","3.81","89.54","Bottom",180
-"R2","3.81","90.81","Bottom",180
-"R3","13.97","90.17","Bottom",0
-"R4","13.97","91.44","Bottom",0
-"R5","3.81","67.95","Bottom",180
-"R6","3.81","69.22","Bottom",180
-"R7","13.97","68.58","Bottom",0
-"R8","13.97","69.85","Bottom",0
-"R9","3.81","88.27","Bottom",180
-"R10","13.97","88.90","Bottom",0
-"R11","3.81","66.67","Bottom",180
-"R12","13.97","67.31","Bottom",0
-"R13","45.09","97.79","Bottom",0
-"R14","34.29","96.52","Bottom",180
-"R15","34.29","95.25","Bottom",180
-"R16","45.09","95.25","Bottom",0
-"R17","41.91","77.47","Bottom",0
-"R18","31.75","76.84","Bottom",180
-"R19","31.75","74.30","Bottom",180
-"R20","41.91","76.20","Bottom",0
-"R21","34.29","93.98","Bottom",180
-"R22","31.75","75.56","Bottom",0
-"R23","45.09","99.06","Bottom",0
-"R24","45.09","96.52","Bottom",180
-"R25","34.29","97.79","Bottom",180
-"R26","41.91","78.74","Bottom",0
-"R27","41.91","74.93","Bottom",180
-"R28","31.75","78.11","Bottom",180
-"R29","22.23","13.97","Bottom",270
-"R30","6.35","9.53","Bottom",90
-"R31","24.77","13.97","Bottom",270
-"R32","5.08","9.53","Bottom",90
-"R33","3.81","46.36","Bottom",180
-"R34","3.81","47.63","Bottom",180
-"R35","13.97","46.99","Bottom",0
-"R36","13.97","48.26","Bottom",0
-"R37","3.81","24.77","Bottom",180
-"R38","3.81","26.04","Bottom",180
-"R39","13.97","25.40","Bottom",0
-"R40","13.97","26.67","Bottom",0
-"R41","3.81","45.09","Bottom",180
-"R42","13.97","45.72","Bottom",0
-"R43","3.81","23.50","Bottom",180
-"R44","13.97","24.13","Bottom",0
-"R45","41.91","55.88","Bottom",0
-"R46","31.75","55.25","Bottom",180
-"R47","31.75","53.98","Bottom",180
-"R48","40.64","34.29","Bottom",0
-"R49","30.48","33.66","Bottom",180
-"R50","30.48","31.12","Bottom",180
-"R51","41.91","53.34","Bottom",0
-"R52","40.64","33.02","Bottom",0
-"R53","41.91","54.61","Bottom",0
-"R54","31.75","52.71","Bottom",180
-"R55","40.64","31.75","Bottom",0
-"R56","30.48","32.38","Bottom",180
-"R57","41.91","57.15","Bottom",0
-"R58","40.64","35.56","Bottom",0
-"R59","31.75","56.52","Bottom",180
-"R60","30.48","34.93","Bottom",180
-"R61","23.50","13.97","Bottom",270
-"R62","26.04","13.97","Bottom",270
-"R63","3.81","9.53","Bottom",90
-"R64","2.54","9.53","Bottom",90
-"R65","22.23","90.17","Bottom",270
-"R66","20.96","90.17","Bottom",270
-"R67","22.23","68.58","Bottom",270
-"R68","20.96","68.58","Bottom",270
-"R69","22.23","46.99","Bottom",270
-"R70","20.96","46.99","Bottom",270
-"R71","22.23","25.40","Bottom",270
-"R72","20.96","25.40","Bottom",270
-"R73","19.69","90.17","Bottom",90
-"R74","19.69","68.58","Bottom",90
-"R75","19.69","46.99","Bottom",90
-"R76","19.69","25.40","Bottom",90
-"R77","1.27","82.55","Bottom",90
-"R78","1.27","60.96","Bottom",90
-"R79","1.27","39.37","Bottom",90
-"R80","1.27","17.78","Bottom",90
-"R81","2.54","82.55","Bottom",270
-"R82","2.54","60.96","Bottom",270
-"R83","2.54","39.37","Bottom",270
-"R84","2.54","17.78","Bottom",270
-"R85","58.42","31.12","Bottom",180
-"R86","27.30","13.97","Bottom",270
-"R87","7.62","9.53","Bottom",90
-"R88","17.78","13.34","Bottom",180
-"R89","7.62","12.07","Bottom",180
-"R90","20.32","6.35","Bottom",180
-"U1","60.96","96.52","Bottom",270
-"U2","60.96","76.20","Bottom",270
-"U3","8.89","90.17","Bottom",90
-"U4","8.89","68.58","Bottom",90
-"U5","50.16","86.36","Bottom",270
-"U6","50.16","72.39","Bottom",270
-"U7","39.37","96.52","Bottom",270
-"U8","36.83","76.20","Bottom",270
-"U9","62.23","54.61","Bottom",270
-"U10","64.77","33.02","Bottom",270
-"U11","8.89","46.99","Bottom",90
-"U12","8.89","25.40","Bottom",90
-"U13","50.16","45.09","Bottom",270
-"U14","50.16","13.97","Bottom",270
-"U15","36.83","54.61","Bottom",270
-"U16","35.56","33.02","Bottom",270
-"U17","20.32","85.09","Bottom",0
-"U18","20.32","63.50","Bottom",0
-"U19","20.32","41.91","Bottom",0
-"U20","20.32","20.32","Bottom",0
-"U21","50.16","33.02","Bottom",180
-"U22","12.70","12.70","Bottom",270
-"X1","50.16","24.13","Bottom",0
diff --git a/stereo_mix/hardware_design/pcb/stereo_mix_back_digital.brd b/stereo_mix/hardware_design/pcb/stereo_mix_back_digital.brd
index ad81157..4cdfcfd 100644
--- a/stereo_mix/hardware_design/pcb/stereo_mix_back_digital.brd
+++ b/stereo_mix/hardware_design/pcb/stereo_mix_back_digital.brd
@@ -36,7 +36,7 @@
-
+
@@ -165,10 +165,11 @@
-jhbruhn 2020
+jhbruhn 2020
-stereo_mix v3
+stereo_mix v4
+gib
@@ -1183,7 +1184,7 @@ Source: http://www.onsemi.co.jp .. LM137M-D.PDF
-
+
@@ -1223,7 +1224,7 @@ Source: http://www.onsemi.co.jp .. LM137M-D.PDF
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diff --git a/stereo_mix/hardware_design/pcb/stereo_mix_back_digital.sch b/stereo_mix/hardware_design/pcb/stereo_mix_back_digital.sch
index acbfb34..6f672fe 100644
--- a/stereo_mix/hardware_design/pcb/stereo_mix_back_digital.sch
+++ b/stereo_mix/hardware_design/pcb/stereo_mix_back_digital.sch
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