The sound gain dialog is now accessible from the menu bar in the "Tools" menu

src/win/86Box.rc

@@ -134,6 +134,8 @@ BEGIN
 # endif
         MENUITEM SEPARATOR
         MENUITEM "Take s&creenshot\tCtrl+F11",  IDM_ACTION_SCREENSHOT
+        MENUITEM SEPARATOR
+        MENUITEM "Sound &gain...",              IDM_SND_GAIN
 #ifdef MTR_ENABLED
         MENUITEM SEPARATOR
         MENUITEM "Begin trace\tCtrl+T",         IDM_ACTION_BEGIN_TRACE

src/win/win_ui.c

@@ -688,6 +688,10 @@ MainWindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
 				win_settings_open(hwnd);
 				break;
 
+			case IDM_SND_GAIN:
+				SoundGainDialogCreate(hwnd);
+				break;
+
 			case IDM_ABOUT:
 				AboutDialogCreate(hwnd);
 				break;