• The user interface code. Responsible for updating the screen. Changing settings, like IA button actions etc.
• The Axefx logic code. Which responds to MIDI inputs, converts hardware events to outgoing MIDI etc.
• The hardware interface code. This is responsible for talking to all the hardware, both inputs and outputs.

The ADS1113/4/5 provide 16 bits of data in binary twos complement format

function BeforeInstall(App, Msg, Actions)
{
    Actions.Add("Scare");
    Msg = Msg + " (BeforeInstall was here)";
    return true;
}

function Install(App, Action)
{
    if (Action == "Scare")
    {
        MsgBox(App, "Boo!");
        return false;
    }
    
    return true;
}

function Main(App)
{
    if (!AddCallback("OnBeforeInstallBar", "BeforeInstall"))
        MsgBox(App, "Couldn't add BeforeInstall");
    if (!AddCallback("OnInstallComponent", "Install"))
        MsgBox(App, "Couldn't add Install");

    return 1;
}

1) HIViewSetFrame inside kEventControlDraw is bad

2) Apple Event handling

3) Editing the Application Menu

case WM_PAINT:
{
    if (!GetCss())
        break;

    // This is the effective background of the parent window:
    GCss::ColorDef bk = GetCss()->NoPaintColor();

    // If it's not the default...
    if (!bk.IsValid())
        break;

    // Then create a screen device context for painting
    GScreenDC dc(this);
    
    // Get the control to draw itself into a bitmap
    GRect c = GetPos();
    
    // Create a HBITMAP in the same size as the control 
    // and the same bit depth as the screen
    GMemDC m(c.X(), c.Y(), GdcD->GetColourSpace());
    // Create a HDC for the bitmap
    HDC hdc = m.StartDC();					
    // Ask the control to draw itself into the memory bitmap
    SendMessage(_View, WM_PRINT, (WPARAM)hdc, PRF_ERASEBKGND|PRF_CLIENT);
    // End the HDC
    m.EndDC();

    // Draw correct background
    m.Colour(bk.Rgb32, 32);
    // The outside 1px border (unfilled rect)
    m.Box(0, 0, c.X()-1, c.Y()-1);
    // The 4 pixels at the corners
    m.Set(1, 1);
    m.Set(c.X()-2, 1);
    m.Set(1, c.Y()-2);
    m.Set(c.X()-2, c.Y()-2);

    // Now stick it on the screen
    dc.Blt(0, 0, &m);

    // Skip over calling the parent class' callback procedure.
    return true;
    break;
}