diff --git a/.github/workflows/synthesis.yml b/.github/workflows/synthesis.yml
index d82e3bb7..b279fb1b 100644
--- a/.github/workflows/synthesis.yml
+++ b/.github/workflows/synthesis.yml
@@ -26,12 +26,12 @@ jobs:
           - tool: quartus
             imagerepo: ghcr.io/raetro/quartus
             imagever: 21.1.1
-            boards: 40
+            boards: 43
             labs: 12345
           - tool: quartus
             imagerepo: ghcr.io/raetro/quartus
             imagever: 13.0sp1
-            boards: 9 35
+            boards: 10 36
             labs: 12345
     steps:
       - name: Checkout
diff --git a/boards/tang_nano_9k_hdmi_tm1638/board_specific_top.sv b/boards/tang_nano_9k_hdmi_tm1638/board_specific_top.sv
index 843cdf5e..180cd53f 100644
--- a/boards/tang_nano_9k_hdmi_tm1638/board_specific_top.sv
+++ b/boards/tang_nano_9k_hdmi_tm1638/board_specific_top.sv
@@ -417,10 +417,10 @@ module board_specific_top
         (
             .clk      ( clk            ),
             .rst      ( rst            ),
-            .lr       ( TF_CS          ),
-            .ws       ( TF_MOSI        ),
-            .sck      ( TF_SCLK        ),
-            .sd       ( TF_MISO        ),
+            .lr       ( TF_CS          ), // 38
+            .ws       ( TF_MOSI        ), // 37
+            .sck      ( TF_SCLK        ), // 36
+            .sd       ( TF_MISO        ), // 39
             .value    ( mic            )
         );
 
diff --git a/labs/3_music/3_0_oscilloscope/01_clean.bash b/labs/3_music/3_0_oscilloscope/01_clean.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/01_clean.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/02_simulate_rtl.bash b/labs/3_music/3_0_oscilloscope/02_simulate_rtl.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/02_simulate_rtl.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/03_synthesize_for_fpga.bash b/labs/3_music/3_0_oscilloscope/03_synthesize_for_fpga.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/03_synthesize_for_fpga.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/04_configure_fpga.bash b/labs/3_music/3_0_oscilloscope/04_configure_fpga.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/04_configure_fpga.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/05_run_gui_for_fpga_synthesis.bash b/labs/3_music/3_0_oscilloscope/05_run_gui_for_fpga_synthesis.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/05_run_gui_for_fpga_synthesis.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/06_choose_another_fpga_board.bash b/labs/3_music/3_0_oscilloscope/06_choose_another_fpga_board.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/06_choose_another_fpga_board.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/07_synthesize_for_asic.bash b/labs/3_music/3_0_oscilloscope/07_synthesize_for_asic.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/07_synthesize_for_asic.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/08_visualize_asic_synthesis_results_1.bash b/labs/3_music/3_0_oscilloscope/08_visualize_asic_synthesis_results_1.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/08_visualize_asic_synthesis_results_1.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/09_visualize_asic_synthesis_results_2.bash b/labs/3_music/3_0_oscilloscope/09_visualize_asic_synthesis_results_2.bash
new file mode 100755
index 00000000..249b1079
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/09_visualize_asic_synthesis_results_2.bash
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail  # See the meaning in scripts/README.md
+
+script=$(basename "$0")
+source_script=${script/\.bash/.source_bash}
+dir_source_script=../scripts/steps/$source_script
+
+for i in {1..3}
+do
+    [ -f $dir_source_script ] && break
+    dir_source_script=../$dir_source_script
+done
+
+if ! [ -f $dir_source_script ]; then
+    printf "$script: cannot find \"$source_script\"\n" 1>&2
+    exit 1
+fi
+
+dir_source_script=$(readlink -f $dir_source_script)
+. "$dir_source_script"
diff --git a/labs/3_music/3_0_oscilloscope/emooc_cc_wiring.jpg b/labs/3_music/3_0_oscilloscope/emooc_cc_wiring.jpg
new file mode 100644
index 00000000..c7be45af
Binary files /dev/null and b/labs/3_music/3_0_oscilloscope/emooc_cc_wiring.jpg differ
diff --git a/labs/3_music/3_0_oscilloscope/gtkwave.tcl b/labs/3_music/3_0_oscilloscope/gtkwave.tcl
new file mode 100644
index 00000000..67b1a193
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/gtkwave.tcl
@@ -0,0 +1,19 @@
+# gtkwave::loadFile "dump.vcd"
+
+set all_signals [list]
+
+lappend all_signals tb.dut.clk
+lappend all_signals tb.dut.rst
+lappend all_signals tb.dut.lr
+lappend all_signals tb.dut.ws
+lappend all_signals tb.dut.sck
+lappend all_signals tb.dut.sd
+lappend all_signals tb.dut.value
+lappend all_signals tb.dut.cnt
+lappend all_signals tb.dut.sample_bit
+lappend all_signals tb.dut.value_done
+lappend all_signals tb.dut.shift
+
+set num_added [ gtkwave::addSignalsFromList $all_signals ]
+
+gtkwave::/Time/Zoom/Zoom_Full
diff --git a/labs/3_music/3_0_oscilloscope/lab_specific_board_config.svh b/labs/3_music/3_0_oscilloscope/lab_specific_board_config.svh
new file mode 100644
index 00000000..0fd1b10a
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/lab_specific_board_config.svh
@@ -0,0 +1,18 @@
+`ifndef LAB_SPECIFIC_CONFIG_SVH
+`define LAB_SPECIFIC_CONFIG_SVH
+
+   `define INSTANTIATE_TM1638_BOARD_CONTROLLER_MODULE
+   `define FORCE_NO_VIRTUAL_TM1638_USING_GRAPHICS
+// `define USE_HCW132_VARIANT_OF_TM1638_BOARD_CONTROLLER_MODULE
+
+   `define DUPLICATE_TM1638_SIGNALS_WITH_REGULAR
+// `define CONCAT_REGULAR_SIGNALS_AND_TM1638
+// `define CONCAT_TM1638_SIGNALS_AND_REGULAR
+
+   `define EMULATE_DYNAMIC_7SEG_ON_STATIC_WITHOUT_STICKY_FLOPS
+
+   `define INSTANTIATE_GRAPHICS_INTERFACE_MODULE
+   `define INSTANTIATE_MICROPHONE_INTERFACE_MODULE
+   `define INSTANTIATE_SOUND_OUTPUT_INTERFACE_MODULE
+
+`endif  // `ifndef LAB_SPECIFIC_CONFIG_SVH
diff --git a/labs/3_music/3_0_oscilloscope/lab_top.sv b/labs/3_music/3_0_oscilloscope/lab_top.sv
new file mode 100644
index 00000000..7b7efc76
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/lab_top.sv
@@ -0,0 +1,123 @@
+`include "config.svh"
+
+module lab_top
+# (
+    parameter  clk_mhz       = 50,
+               w_key         = 4,
+               w_sw          = 8,
+               w_led         = 8,
+               w_digit       = 8,
+               w_gpio        = 100,
+
+               screen_width  = 640,
+               screen_height = 480,
+
+               w_red         = 4,
+               w_green       = 4,
+               w_blue        = 4,
+
+               w_x           = $clog2 ( screen_width  ),
+               w_y           = $clog2 ( screen_height )
+)
+(
+    input                        clk,
+    input                        slow_clk,
+    input                        rst,
+
+    // Keys, switches, LEDs
+
+    input        [w_key   - 1:0] key,
+    input        [w_sw    - 1:0] sw,
+    output logic [w_led   - 1:0] led,
+
+    // A dynamic seven-segment display
+
+    output logic [          7:0] abcdefgh,
+    output logic [w_digit - 1:0] digit,
+
+    // Graphics
+
+    input        [w_x     - 1:0] x,
+    input        [w_y     - 1:0] y,
+
+    output logic [w_red   - 1:0] red,
+    output logic [w_green - 1:0] green,
+    output logic [w_blue  - 1:0] blue,
+
+    // Microphone, sound output and UART
+
+    input        [         23:0] mic,
+    output       [         15:0] sound,
+
+    input                        uart_rx,
+    output                       uart_tx,
+
+    // General-purpose Input/Output
+
+    inout        [w_gpio  - 1:0] gpio
+);
+
+    //------------------------------------------------------------------------
+
+    // assign led        = '0;
+    // assign abcdefgh   = '0;
+    // assign digit      = '0;
+    // assign red        = '0;
+    // assign green      = '0;
+    // assign blue       = '0;
+       assign sound      = '0;
+       assign uart_tx    = '1;
+    
+    logic                   white;
+    assign red   = {w_red  {white}};
+    assign green = {w_green{white}};
+    assign blue  = {w_blue {white}};
+
+
+    //------------------------------------------------------------------------
+    //
+    //  Oscilloscope
+    //
+    //------------------------------------------------------------------------
+
+    // It is enough for the counter to be 20 bit. Why?
+
+    logic        [23:0]    prev_mic;
+    logic        [19:0]    counter;
+    logic        [19:0]    distance;
+    logic signed [w_y-1:0] bufy[screen_width/2];
+    wire  signed [w_y-1:0] micy = {mic[23], (mic[23]?~&mic[22:16]:|mic[22:16])? ~{(w_y-1){$signed(mic[23])}} : mic[15-:w_y-1]};
+    wire         [w_x-1:0] cnt  = counter[19-:w_x];
+    localparam logic signed [w_y-1:0] midy = screen_height/2;
+
+    always_comb
+        white = (x>>1) < (distance[19-:w_x]) && y == midy - bufy[(x>>1)] && x < screen_width && y < screen_height;
+
+    always_ff @ (posedge clk or posedge rst)
+        if (rst)
+        begin
+            prev_mic <= '0;
+            counter  <= '0;
+            distance <= '0;
+        end
+        else
+        begin
+            if (cnt < screen_width/2)
+                bufy[cnt] <= micy;
+
+            prev_mic <= mic;
+
+            // Crossing from negative to positive numbers
+            if (  prev_mic [$left ( prev_mic )] == 1'b1
+                & mic      [$left ( mic      )] == 1'b0 )
+            begin
+               distance <= counter;
+               counter  <= 20'h0;
+            end
+            else if (counter != ~ 20'h0)  // To prevent overflow
+            begin
+               counter <= counter + 20'h1;
+            end
+        end
+
+endmodule
diff --git a/labs/3_music/3_0_oscilloscope/mic_waves.png b/labs/3_music/3_0_oscilloscope/mic_waves.png
new file mode 100644
index 00000000..52015ec7
Binary files /dev/null and b/labs/3_music/3_0_oscilloscope/mic_waves.png differ
diff --git a/labs/3_music/3_0_oscilloscope/tb.sv b/labs/3_music/3_0_oscilloscope/tb.sv
new file mode 100644
index 00000000..635253ca
--- /dev/null
+++ b/labs/3_music/3_0_oscilloscope/tb.sv
@@ -0,0 +1,148 @@
+`include "config.svh"
+
+// This testbench is for microphone module only
+
+module tb;
+
+    logic       clk;
+    logic       rst;
+    wire        lr;
+    wire        ws;
+    wire        sck;
+    logic       sd;
+    wire [23:0] value;
+
+    //------------------------------------------------------------------------
+
+    inmp441_mic_i2s_receiver dut (.*);
+
+    //------------------------------------------------------------------------
+
+    initial
+    begin
+        clk = 1'b0;
+
+        forever
+            # 5 clk = ~ clk;
+    end
+
+    //------------------------------------------------------------------------
+
+    initial
+    begin
+        rst <= 1'bx;
+        repeat (2) @ (posedge clk);
+        rst <= 1'b1;
+        repeat (2) @ (posedge clk);
+        rst <= 1'b0;
+    end
+
+    //------------------------------------------------------------------------
+
+    initial
+    begin
+        `ifdef __ICARUS__
+            $dumpvars;
+        `endif
+
+        @ (negedge rst);
+
+        repeat (100000)
+        begin
+            sd <= $urandom ();
+            @ (posedge clk);
+        end
+
+        $finish;
+    end
+
+endmodule
+
+//----------------------------------------------------------------------------
+
+`ifdef UNDEFINED
+
+module tb;
+
+    localparam clk_mhz = 1,
+               w_key   = 4,
+               w_sw    = 8,
+               w_led   = 8,
+               w_digit = 8,
+               w_gpio  = 100;
+
+    //------------------------------------------------------------------------
+
+    logic       clk;
+    logic       rst;
+    logic [3:0] key;
+    logic [7:0] sw;
+
+    //------------------------------------------------------------------------
+
+    lab_top
+    # (
+        .clk_mhz ( clk_mhz ),
+        .w_key   ( w_key   ),
+        .w_sw    ( w_sw    ),
+        .w_led   ( w_led   ),
+        .w_digit ( w_digit ),
+        .w_gpio  ( w_gpio  )
+    )
+    i_lab_top
+    (
+        .clk      ( clk ),
+        .slow_clk ( clk ),
+        .rst      ( rst ),
+        .key      ( key ),
+        .sw       ( sw  )
+    );
+
+    //------------------------------------------------------------------------
+
+    initial
+    begin
+        clk = 1'b0;
+
+        forever
+            # 5 clk = ~ clk;
+    end
+
+    //------------------------------------------------------------------------
+
+    initial
+    begin
+        rst <= 1'bx;
+        repeat (2) @ (posedge clk);
+        rst <= 1'b1;
+        repeat (2) @ (posedge clk);
+        rst <= 1'b0;
+    end
+
+    //------------------------------------------------------------------------
+
+    initial
+    begin
+        `ifdef __ICARUS__
+            $dumpvars;
+        `endif
+
+        key <= '0;
+        sw  <= '0;
+
+        @ (negedge rst);
+
+        repeat (50)
+        begin
+            @ (posedge clk);
+
+            key <= $urandom ();
+            sw  <= $urandom ();
+        end
+
+        $finish;
+    end
+
+endmodule
+
+`endif
diff --git a/peripherals/inmp441_mic_i2s_receiver_new.sv b/peripherals/inmp441_mic_i2s_receiver_new.sv
index 7ff424db..184a19f1 100644
--- a/peripherals/inmp441_mic_i2s_receiver_new.sv
+++ b/peripherals/inmp441_mic_i2s_receiver_new.sv
@@ -40,11 +40,11 @@ module inmp441_mic_i2s_receiver
     logic       sck_negedge; // Tracks SCK negedge
 
     always_ff @ (posedge clk or posedge rst)
-        if (rst)
+        if (rst) begin
             cnt <= '0;
             sck_posedge <= '0;
             sck_negedge <= '0;
-        else
+        end else
             if (cnt == sck_clock_divisor - 1'b1) // Every N cycles drive SCK up or down
             begin
                 sck <= ~ sck;