diff --git a/src/config.c b/src/config.c
index 6399c91ab..7641c637c 100644
--- a/src/config.c
+++ b/src/config.c
@@ -718,6 +718,24 @@ load_sound(void)
 
     mpu401_standalone_enable = !!ini_section_get_int(cat, "mpu401_standalone", 0);
 
+    /* Backwards compatibility for standalone SSI-2001, CMS and GUS from v3.11 and older. */
+    const char *legacy_cards[][2] = {
+        {"ssi2001",      "ssi2001"},
+        { "gameblaster", "cms"    },
+        { "gus",         "gus"    }
+    };
+    for (int i = 0, j = 0; i < (sizeof(legacy_cards) / sizeof(legacy_cards[0])); i++) {
+        if (ini_section_get_int(cat, legacy_cards[i][0], 0) == 1) {
+            /* Migrate to the first available sound card slot. */
+            for (; j < (sizeof(sound_card_current) / sizeof(sound_card_current[0])); j++) {
+                if (!sound_card_current[j]) {
+                    sound_card_current[j] = sound_card_get_from_internal_name(legacy_cards[i][1]);
+                    break;
+                }
+            }
+        }
+    }
+
     memset(temp, '\0', sizeof(temp));
     p = ini_section_get_string(cat, "sound_type", "float");
     if (strlen(p) > 511)
@@ -2159,7 +2177,7 @@ save_machine(void)
     else
         ini_section_delete_var(cat, "cpu_override");
 
-    /* Forwards compatibility with the previous CPU model system. */
+    /* Downgrade compatibility with the previous CPU model system. */
     ini_section_delete_var(cat, "cpu_manufacturer");
     ini_section_delete_var(cat, "cpu");
 
@@ -2390,6 +2408,27 @@ save_sound(void)
     else
         ini_section_set_int(cat, "mpu401_standalone", mpu401_standalone_enable);
 
+    /* Downgrade compatibility for standalone SSI-2001, CMS and GUS from v3.11 and older. */
+    const char *legacy_cards[][2] = {
+        {"ssi2001",      "ssi2001"},
+        { "gameblaster", "cms"    },
+        { "gus",         "gus"    }
+    };
+    for (int i = 0; i < (sizeof(legacy_cards) / sizeof(legacy_cards[0])); i++) {
+        int card_id = sound_card_get_from_internal_name(legacy_cards[i][1]);
+        for (int j = 0; j < (sizeof(sound_card_current) / sizeof(sound_card_current[0])); j++) {
+            if (sound_card_current[j] == card_id) {
+                /* A special value of 2 still enables the cards on older versions,
+                   but lets newer versions know that they've already been migrated. */
+                ini_section_set_int(cat, legacy_cards[i][0], 2);
+                card_id = 0; /* mark as found */
+                break;
+            }
+        }
+        if (card_id > 0) /* not found */
+            ini_section_delete_var(cat, legacy_cards[i][0]);
+    }
+
     if (sound_is_float == 1)
         ini_section_delete_var(cat, "sound_type");
     else
diff --git a/src/include/86box/ini.h b/src/include/86box/ini.h
index 5eca9ab8c..866787352 100644
--- a/src/include/86box/ini.h
+++ b/src/include/86box/ini.h
@@ -30,26 +30,26 @@ typedef void *ini_t;
 typedef void *ini_section_t;
 
 extern ini_t ini_new(void);
-extern ini_t ini_read(char *fn);
-extern void  ini_write(ini_t ini, char *fn);
+extern ini_t ini_read(const char *fn);
+extern void  ini_write(ini_t ini, const char *fn);
 extern void  ini_dump(ini_t ini);
 extern void  ini_close(ini_t ini);
 
-extern void     ini_section_delete_var(ini_section_t section, char *name);
-extern int      ini_section_get_int(ini_section_t section, char *name, int def);
-extern double   ini_section_get_double(ini_section_t section, char *name, double def);
-extern int      ini_section_get_hex16(ini_section_t section, char *name, int def);
-extern int      ini_section_get_hex20(ini_section_t section, char *name, int def);
-extern int      ini_section_get_mac(ini_section_t section, char *name, int def);
-extern char    *ini_section_get_string(ini_section_t section, char *name, char *def);
-extern wchar_t *ini_section_get_wstring(ini_section_t section, char *name, wchar_t *def);
-extern void     ini_section_set_int(ini_section_t section, char *name, int val);
-extern void     ini_section_set_double(ini_section_t section, char *name, double val);
-extern void     ini_section_set_hex16(ini_section_t section, char *name, int val);
-extern void     ini_section_set_hex20(ini_section_t section, char *name, int val);
-extern void     ini_section_set_mac(ini_section_t section, char *name, int val);
+extern void     ini_section_delete_var(ini_section_t section, const char *name);
+extern int      ini_section_get_int(ini_section_t section, const char *name, int def);
+extern double   ini_section_get_double(ini_section_t section, const char *name, double def);
+extern int      ini_section_get_hex16(ini_section_t section, const char *name, int def);
+extern int      ini_section_get_hex20(ini_section_t section, const char *name, int def);
+extern int      ini_section_get_mac(ini_section_t section, const char *name, int def);
+extern char    *ini_section_get_string(ini_section_t section, const char *name, char *def);
+extern wchar_t *ini_section_get_wstring(ini_section_t section, const char *name, wchar_t *def);
+extern void     ini_section_set_int(ini_section_t section, const char *name, int val);
+extern void     ini_section_set_double(ini_section_t section, const char *name, double val);
+extern void     ini_section_set_hex16(ini_section_t section, const char *name, int val);
+extern void     ini_section_set_hex20(ini_section_t section, const char *name, int val);
+extern void     ini_section_set_mac(ini_section_t section, const char *name, int val);
 extern void     ini_section_set_string(ini_section_t section, const char *name, const char *val);
-extern void     ini_section_set_wstring(ini_section_t section, char *name, wchar_t *val);
+extern void     ini_section_set_wstring(ini_section_t section, const char *name, wchar_t *val);
 
 #define ini_delete_var(ini, head, name)       ini_section_delete_var(ini_find_section(ini, head), name)
 
@@ -69,13 +69,13 @@ extern void     ini_section_set_wstring(ini_section_t section, char *name, wchar
 #define ini_set_string(ini, head, name, val)  ini_section_set_string(ini_find_or_create_section(ini, head), name, val)
 #define ini_set_wstring(ini, head, name, val) ini_section_set_wstring(ini_find_or_create_section(ini, head), name, val)
 
-extern ini_section_t ini_find_section(ini_t ini, char *name);
-extern ini_section_t ini_find_or_create_section(ini_t ini, char *name);
-extern void          ini_rename_section(ini_section_t section, char *name);
+extern ini_section_t ini_find_section(ini_t ini, const char *name);
+extern ini_section_t ini_find_or_create_section(ini_t ini, const char *name);
+extern void          ini_rename_section(ini_section_t section, const char *name);
 extern void          ini_delete_section_if_empty(ini_t ini, ini_section_t section);
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/include/86box/sound.h b/src/include/86box/sound.h
index dada9e164..9f36a70b6 100644
--- a/src/include/86box/sound.h
+++ b/src/include/86box/sound.h
@@ -24,13 +24,13 @@
 
 extern int sound_gain;
 
-#define FREQ_44100 44100
-#define FREQ_48000 48000
-#define FREQ_49716 49716
-#define FREQ_88200 88200
-#define FREQ_96000 96000
+#define FREQ_44100  44100
+#define FREQ_48000  48000
+#define FREQ_49716  49716
+#define FREQ_88200  88200
+#define FREQ_96000  96000
 
-#define SOUND_FREQ FREQ_48000
+#define SOUND_FREQ  FREQ_48000
 #define SOUNDBUFLEN (SOUND_FREQ / 50)
 
 #define CD_FREQ     FREQ_44100
@@ -62,7 +62,7 @@ extern const device_t *sound_card_getdevice(int card);
 #endif
 extern int   sound_card_has_config(int card);
 extern char *sound_card_get_internal_name(int card);
-extern int   sound_card_get_from_internal_name(char *s);
+extern int   sound_card_get_from_internal_name(const char *s);
 extern void  sound_card_init(void);
 extern void  sound_set_cd_volume(unsigned int vol_l, unsigned int vol_r);
 
diff --git a/src/ini.c b/src/ini.c
index 009d21c0b..d41573bed 100644
--- a/src/ini.c
+++ b/src/ini.c
@@ -101,10 +101,10 @@ ini_log(const char *fmt, ...)
 #endif
 
 static section_t *
-find_section(list_t *head, char *name)
+find_section(list_t *head, const char *name)
 {
     section_t *sec     = (section_t *) head->next;
-    char       blank[] = "";
+    const char blank[] = "";
 
     if (name == NULL)
         name = blank;
@@ -120,7 +120,7 @@ find_section(list_t *head, char *name)
 }
 
 ini_section_t
-ini_find_section(ini_t ini, char *name)
+ini_find_section(ini_t ini, const char *name)
 {
     if (ini == NULL)
         return NULL;
@@ -129,7 +129,7 @@ ini_find_section(ini_t ini, char *name)
 }
 
 void
-ini_rename_section(ini_section_t section, char *name)
+ini_rename_section(ini_section_t section, const char *name)
 {
     section_t *sec = (section_t *) section;
 
@@ -197,7 +197,7 @@ ini_delete_section_if_empty(ini_t ini, ini_section_t section)
 }
 
 static section_t *
-create_section(list_t *head, char *name)
+create_section(list_t *head, const char *name)
 {
     section_t *ns = malloc(sizeof(section_t));
 
@@ -209,7 +209,7 @@ create_section(list_t *head, char *name)
 }
 
 ini_section_t
-ini_find_or_create_section(ini_t ini, char *name)
+ini_find_or_create_section(ini_t ini, const char *name)
 {
     if (ini == NULL)
         return NULL;
@@ -263,7 +263,7 @@ ini_close(ini_t ini)
 }
 
 static int
-ini_detect_bom(char *fn)
+ini_detect_bom(const char *fn)
 {
     FILE         *f;
     unsigned char bom[4] = { 0, 0, 0, 0 };
@@ -311,7 +311,7 @@ ini_fgetws(wchar_t *str, int count, FILE *stream)
 
 /* Read and parse the configuration file into memory. */
 ini_t
-ini_read(char *fn)
+ini_read(const char *fn)
 {
     char       sname[128], ename[128];
     wchar_t    buff[1024];
@@ -438,7 +438,7 @@ ini_read(char *fn)
 
 /* Write the in-memory configuration to disk. */
 void
-ini_write(ini_t ini, char *fn)
+ini_write(ini_t ini, const char *fn)
 {
     wchar_t    wtemp[512];
     list_t    *list = (list_t *) ini;
@@ -521,7 +521,7 @@ ini_dump(ini_t ini)
 }
 
 void
-ini_section_delete_var(ini_section_t self, char *name)
+ini_section_delete_var(ini_section_t self, const char *name)
 {
     section_t *section = (section_t *) self;
     entry_t   *entry;
@@ -537,7 +537,7 @@ ini_section_delete_var(ini_section_t self, char *name)
 }
 
 int
-ini_section_get_int(ini_section_t self, char *name, int def)
+ini_section_get_int(ini_section_t self, const char *name, int def)
 {
     section_t *section = (section_t *) self;
     entry_t   *entry;
@@ -556,7 +556,7 @@ ini_section_get_int(ini_section_t self, char *name, int def)
 }
 
 double
-ini_section_get_double(ini_section_t self, char *name, double def)
+ini_section_get_double(ini_section_t self, const char *name, double def)
 {
     section_t *section = (section_t *) self;
     entry_t   *entry;
@@ -575,7 +575,7 @@ ini_section_get_double(ini_section_t self, char *name, double def)
 }
 
 int
-ini_section_get_hex16(ini_section_t self, char *name, int def)
+ini_section_get_hex16(ini_section_t self, const char *name, int def)
 {
     section_t   *section = (section_t *) self;
     entry_t     *entry;
@@ -594,7 +594,7 @@ ini_section_get_hex16(ini_section_t self, char *name, int def)
 }
 
 int
-ini_section_get_hex20(ini_section_t self, char *name, int def)
+ini_section_get_hex20(ini_section_t self, const char *name, int def)
 {
     section_t   *section = (section_t *) self;
     entry_t     *entry;
@@ -613,7 +613,7 @@ ini_section_get_hex20(ini_section_t self, char *name, int def)
 }
 
 int
-ini_section_get_mac(ini_section_t self, char *name, int def)
+ini_section_get_mac(ini_section_t self, const char *name, int def)
 {
     section_t   *section = (section_t *) self;
     entry_t     *entry;
@@ -632,7 +632,7 @@ ini_section_get_mac(ini_section_t self, char *name, int def)
 }
 
 char *
-ini_section_get_string(ini_section_t self, char *name, char *def)
+ini_section_get_string(ini_section_t self, const char *name, char *def)
 {
     section_t *section = (section_t *) self;
     entry_t   *entry;
@@ -648,7 +648,7 @@ ini_section_get_string(ini_section_t self, char *name, char *def)
 }
 
 wchar_t *
-ini_section_get_wstring(ini_section_t self, char *name, wchar_t *def)
+ini_section_get_wstring(ini_section_t self, const char *name, wchar_t *def)
 {
     section_t *section = (section_t *) self;
     entry_t   *entry;
@@ -664,7 +664,7 @@ ini_section_get_wstring(ini_section_t self, char *name, wchar_t *def)
 }
 
 void
-ini_section_set_int(ini_section_t self, char *name, int val)
+ini_section_set_int(ini_section_t self, const char *name, int val)
 {
     section_t *section = (section_t *) self;
     entry_t   *ent;
@@ -681,7 +681,7 @@ ini_section_set_int(ini_section_t self, char *name, int val)
 }
 
 void
-ini_section_set_double(ini_section_t self, char *name, double val)
+ini_section_set_double(ini_section_t self, const char *name, double val)
 {
     section_t *section = (section_t *) self;
     entry_t   *ent;
@@ -698,7 +698,7 @@ ini_section_set_double(ini_section_t self, char *name, double val)
 }
 
 void
-ini_section_set_hex16(ini_section_t self, char *name, int val)
+ini_section_set_hex16(ini_section_t self, const char *name, int val)
 {
     section_t *section = (section_t *) self;
     entry_t   *ent;
@@ -715,7 +715,7 @@ ini_section_set_hex16(ini_section_t self, char *name, int val)
 }
 
 void
-ini_section_set_hex20(ini_section_t self, char *name, int val)
+ini_section_set_hex20(ini_section_t self, const char *name, int val)
 {
     section_t *section = (section_t *) self;
     entry_t   *ent;
@@ -732,7 +732,7 @@ ini_section_set_hex20(ini_section_t self, char *name, int val)
 }
 
 void
-ini_section_set_mac(ini_section_t self, char *name, int val)
+ini_section_set_mac(ini_section_t self, const char *name, int val)
 {
     section_t *section = (section_t *) self;
     entry_t   *ent;
@@ -774,7 +774,7 @@ ini_section_set_string(ini_section_t self, const char *name, const char *val)
 }
 
 void
-ini_section_set_wstring(ini_section_t self, char *name, wchar_t *val)
+ini_section_set_wstring(ini_section_t self, const char *name, wchar_t *val)
 {
     section_t *section = (section_t *) self;
     entry_t   *ent;
diff --git a/src/qt/qt_settingsstoragecontrollers.ui b/src/qt/qt_settingsstoragecontrollers.ui
index 558d4c441..9fc0ea519 100644
--- a/src/qt/qt_settingsstoragecontrollers.ui
+++ b/src/qt/qt_settingsstoragecontrollers.ui
@@ -54,16 +54,26 @@
        <property name="text">
         <string>CD-ROM Controller:</string>
        </property>
+       <property name="visible">
+        <bool>false</bool>
+       </property>
       </widget>
      </item>
      <item row="2" column="1">
-      <widget class="QComboBox" name="comboBoxCDInterface"/>
+      <widget class="QComboBox" name="comboBoxCDInterface">
+       <property name="visible">
+        <bool>false</bool>
+       </property>
+      </widget>
      </item>
      <item row="2" column="2">
       <widget class="QPushButton" name="pushButtonCDInterface">
        <property name="text">
         <string>Configure</string>
        </property>
+       <property name="visible">
+        <bool>false</bool>
+       </property>
       </widget>
      </item>
      <item row="0" column="1">
diff --git a/src/sound/sound.c b/src/sound/sound.c
index dbfaf0fdb..d8791d0cf 100644
--- a/src/sound/sound.c
+++ b/src/sound/sound.c
@@ -202,7 +202,7 @@ sound_card_get_internal_name(int card)
 }
 
 int
-sound_card_get_from_internal_name(char *s)
+sound_card_get_from_internal_name(const char *s)
 {
     int c = 0;