How to customize this oscilloscope picture?

This is an oscilloscope picture which I copy-pasted from texample.net
I modified the code a little bit and now, I am stuck with two things:

  • I would like to draw some probes that are connected to the oscilloscope at the channel 1, the Channel 2 and the ground terminals.
  • I have no idea how to set up the Volts/Div knobs on the lower right panel. I want to set them up independently. You can have a look at the MWE I am posting below.

Can someone help me do these?

    documentclass[border=5mm]{standalone}
    usepackage{tikz}

    begin{document}
    defscl{0.6}%scaling factor of the picture
    begin{tikzpicture}[
      scale=scl,
      controlpanels/.style={yellow!30!brown!20!,rounded corners,draw=black,thick},
      screen/.style={green!50!black!60!,draw=black,thick},
      trace/.style={green!60!yellow!40!, ultra thick},
      smallbutton/.style={white,draw=black, thick},
      axes/.style={thick}]
      fill[green!30!blue!30!,rounded corners,draw=black,thick](0,0)
        rectangle (27.75,13.25);
      fill[fill=black!40!,draw=black,thick,rounded corners](0.25,0.25) rectangle (27.5,13.00);
      % Screen, centered around the origin then shifted for easy plotting
      begin{scope}[xshift=6.5cm,yshift=6.6cm,samples=150, scale=1.1]
        fill[black!60!,rounded corners,draw=black,thick](-5.3,-5.3)
  rectangle (5.3,5.3);
        fill[screen] (-5.0,-5.0) rectangle (5.0,5.0);
        draw[trace] plot(x,{1+2.4*sin((2.5*x +1) r)}); % r for radians...
        draw[trace] plot(x,{-1+1.25*sin((0.75*x) r});
        draw[thin] (-5.0,-5.0) grid (5.0,5.0);
        draw[axes] (-5,0)--(5,0); % Time axis
        draw[axes] (0,-5)--(0,5);
        foreach i in {-4.8,-4.6,...,4.8} draw (i,-0.1)--(i,0.1);
        foreach i in {-4.8,-4.6,...,4.8} draw (-0.1,i)--(0.1,i);
      end{scope}
      % Feet
      fill[black!70!,rounded corners,xshift=2cm] (0,-.5) rectangle (2,0);
      fill[black!70!,rounded corners,xshift=23.75cm] (0,-.5) rectangle (2,0);
      % Lower right panel
      fill[controlpanels] (12.7,0.5) rectangle (27.1,6.2);
      %Channels
      % CH I
      draw[thick] (14.8,1.5) circle (0.7cm);
      fill[gray,draw=black,thick] (14.8,1.5) circle (0.5cm);
      fill[white,draw=black,thick] (14.8,1.5) circle (0.3cm);
      node[scale={1.5*scl}] at (14.8,2.5) {CH I};
      draw[thick] (16.2,1.5) circle (0.4cm);
      fill[black!60!] (16.2,1.5) circle (0.3cm);
      draw[thick] (16.6,1.5) --(17,1.5)--(17,1.0);
      draw[thick] (16.7,1.0)--(17.3,1.0);
      draw[thick] (16.8,0.85)--(17.2,0.85);
      draw[thick] (16.9,0.70)--(17.1,0.70);
      draw[thick] (26.0,1.5) circle (0.7cm);
      % CH II
      fill[gray,draw=black,thick] (26,1.5) circle (0.5cm);
      fill[white,draw=black,thick] (26,1.5) circle (0.3cm);
      node[scale={1.5*scl}] at (26,2.5) {CH II};
      draw[thick] (24.6,1.5) circle (0.4cm);
      fill[black!60!] (24.6,1.5) circle (0.3cm);
      draw[thick] (24.2,1.5) --(23.7,1.5)--(23.7,1.0);
      draw[thick] (23.4,1.0)--(24.0,1.0);
      draw[thick] (23.5,0.85)--(23.9,0.85);
      draw[thick] (23.6,0.70)--(23.8,0.70);
      draw[thick] (26.0,1.5) circle (0.7cm);
      % Y-pos
      fill[smallbutton] (14.8,4.9) circle (0.3cm);
      node[scale={scl}] at (14.8,5.5) {Y-pos I};
      fill[smallbutton] (26.0,4.9) circle (0.3cm);
      node[scale={scl}] at (26.0,5.5) {Y-pos II};
      % Volt/div the foreach loop draws the two buttons
      foreach i / b in {18/75,22.5/345}{
      %Second parameter of the loop is the angle of the index mark 
      begin{scope}[xshift=i cm,yshift=3.8cm,scale=0.85]
        node[scale=scl] at (0,2.3) {Volts/Div};
        node[scale=scl,black] at (-1,-2.4) {V};
        node[scale=scl,blue]  at (1,-2.4) {mV};
        clip[rounded corners] (-2,-2) rectangle (2,2);
        fill[black!30!,rounded corners,draw=black,thick] (-2,-2)
  rectangle (2,2);
        fill[blue!50!black!20!,draw=black,thick]      (30:1.1)--(30:3)--(3,-3)--(-90:3)--(-90:1.1) arc (-90:30:1.1);
        draw[very thick,rounded corners](-2,-2) rectangle (2,2);
        draw[thick] (0,0) circle (1.0);
        foreach i in {0,30,...,330}
          draw[thick] (i:1.2)--(i:2.5);
        foreach i/j in {15/50,45/.1,75/.2,105/.5,135/1,165/2,195/5,225/10,
  255/20,285/5,315/10,345/20} node[scale=scl,black] at (i:1.7) {j};
        fill[blue!30!black!60!,draw=black,thick] (0,0) circle (0.8cm);
        % Here you set the right Volts/Div button
        %========================================================
        %        HERE IS THE SETTING WHICH I DON'T UNDERSTAND"
        %========================================================
        draw[ultra thick,red] (b:0.3)--(b:1.2);
      end{scope}}
    % Upper right panel
      fill[controlpanels] (12.7,6.5) rectangle (27.1,12.75);
      %On-Off button
      draw[rounded corners,thick,blue] (13.9,10.5) rectangle (15.9,12.5);
      fill[fill=red,draw=black,thick,rounded corners] (14.4,10.8) rectangle (15.3,11.2);
      node[scale=scl] at (14.8,12) {textbf{Power}};
      node[scale=scl] at (14.8,11.5) {textbf{On/Off}};
      % Focus-Intensity buttons
      draw[rounded corners,thick,blue] (13.9,7.0) rectangle (15.9,10.0);
      fill[smallbutton] (14.9,7.5) circle (0.3cm);
      node[scale=scl] at (14.9,8.2) {textbf{Focus}};
      fill[smallbutton] (14.9,9) circle (0.3cm);
      node[scale=scl] at (14.9,9.6) {textbf{Intens}};
      % X-pos
      fill[smallbutton] (24.5,9.9) circle (0.3cm);
      node[scale={scl}] at (24.5,10.5) {X-pos};
      % Time/Div
      begin{scope}[xshift=21cm,yshift=9.5cm,scale=1]
        node[scale={1.25*scl}]  at (0,2.4) {Time/Div};
        clip[rounded corners] (-2.2,-2) rectangle (2.2,2);
        fill[black!30!,rounded corners,draw=black,thick] (-2.2,-2) rectangle (2.2,2);
        fill[blue!50!black!20!,draw=black,thick] (45:1.1)--(45:3)--(3,-3)--(-90:3)--(-90:1.1) arc (-90:45:1.1);
        fill[green!50!black!40!,draw=black,thick]
          (45:1.1)--(45:3) arc(45:207:3) --(207:1.1) arc (207:45:1.1);
        draw[very thick,rounded corners](-2.2,-2) rectangle (2.2,2);
        node[scale={1.25*scl}] at (-1.6,-1.6) {$s$};
        node[scale={1.25*scl}] at (1.6,-1.6) {$mu{},s$};
        node[scale={1.25*scl}] at (-1.6,1.6) {$m,s$};
        draw[thick] (0,0) circle (1.0);
        foreach i in {-72,-54,...,262} draw[thick] (i:1.15)--(i:1.35);
        foreach i/j in {-72/.5,-54/1,-36/2,-18/5,0/10,18/20,36/50,54/.1,72/.2,90/.5,
  108/1,126/2,144/5,162/10,180/20,198/50,216/.1,234/.2,252/.5}
          node[scale=scl,black] at (i:1.7){j};
        fill[blue!30!black!60!,draw=black,thick] (0,0) circle (0.8cm);
        % Here you set the Time/Div button
        draw[ultra thick,red] (-18:0.3)--(-18:1.2);    
        % X-pos
      end{scope}
    end{tikzpicture}
    end{document}

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