diff --git a/Source/diablo.cpp b/Source/diablo.cpp
index f7e301862..4537ea335 100644
--- a/Source/diablo.cpp
+++ b/Source/diablo.cpp
@@ -15,7 +15,7 @@ BOOL gbRunGame; // weak
 int glMid3Seed[NUMLEVELS];
 int gbRunGameResult; // weak
 int zoomflag; // weak
-int gbProcessPlayers; // weak
+BOOL gbProcessPlayers; // weak
 int glEndSeed[NUMLEVELS];
 int dword_5256E8; // weak
 HINSTANCE ghInst; // idb
@@ -162,7 +162,7 @@ void __fastcall run_game_loop(int uMsg)
 	control_update_life_mana();
 	msg_process_net_packets();
 	gbRunGame = TRUE;
-	gbProcessPlayers = 1;
+	gbProcessPlayers = TRUE;
 	gbRunGameResult = 1;
 	drawpanflag = 255;
 	DrawAndBlit();
diff --git a/Source/diablo.h b/Source/diablo.h
index aecdd9c30..81426e40f 100644
--- a/Source/diablo.h
+++ b/Source/diablo.h
@@ -15,7 +15,7 @@ extern BOOL gbRunGame; // weak
 extern int glMid3Seed[NUMLEVELS];
 extern int gbRunGameResult; // weak
 extern int zoomflag; // weak
-extern int gbProcessPlayers; // weak
+extern BOOL gbProcessPlayers; // weak
 extern int glEndSeed[NUMLEVELS];
 extern int dword_5256E8; // weak
 extern HINSTANCE ghInst; // idb
diff --git a/Source/effects.cpp b/Source/effects.cpp
index 480f15fc6..6d8dfa8ad 100644
--- a/Source/effects.cpp
+++ b/Source/effects.cpp
@@ -975,7 +975,6 @@ void __fastcall PlayEffect(int i, int mode)
 
 	snd_play_snd(snd, lVolume, lPan);
 }
-// 4A22D5: using guessed type char gbSoundOn;
 // 676194: using guessed type char gbBufferMsgs;
 
 BOOL __fastcall calc_snd_position(int x, int y, int *plVolume, int *plPan)
@@ -1037,7 +1036,6 @@ void __fastcall PlaySFX_priv(TSFX *pSFX, BOOL loc, int x, int y)
 	if ( pSFX->pSnd )
 		snd_play_snd(pSFX->pSnd, lVolume, lPan);
 }
-// 4A22D5: using guessed type char gbSoundOn;
 // 676194: using guessed type char gbBufferMsgs;
 // 679660: using guessed type char gbMaxPlayers;
 
@@ -1243,4 +1241,3 @@ void __stdcall effects_play_sound(char *snd_file)
 	}
 
 }
-// 4A22D5: using guessed type char gbSoundOn;
diff --git a/Source/gamemenu.cpp b/Source/gamemenu.cpp
index 6eae2a4c6..888fa2c65 100644
--- a/Source/gamemenu.cpp
+++ b/Source/gamemenu.cpp
@@ -261,11 +261,11 @@ void __fastcall gamemenu_sound_volume(int a1)
 
 	if ( a1 ) {
 		if ( gbSoundOn ) {
-			gbSoundOn = 0;
+			gbSoundOn = FALSE;
 			FreeMonsterSnd();
 			v1 = VOLUME_MIN;
 		} else {
-			gbSoundOn = 1;
+			gbSoundOn = TRUE;
 		}
 		sound_get_or_set_sound_volume(VOLUME_MAX);
 	} else {
@@ -273,17 +273,16 @@ void __fastcall gamemenu_sound_volume(int a1)
 		sound_get_or_set_sound_volume(v2);
 		if ( v2 == VOLUME_MIN ) {
 			if ( gbSoundOn ) {
-				gbSoundOn = 0;
+				gbSoundOn = FALSE;
 				FreeMonsterSnd();
 			}
 		} else if ( !gbSoundOn ) {
-			gbSoundOn = 1;
+			gbSoundOn = TRUE;
 		}
 	}
 	PlaySFX(IS_TITLEMOV);
 	gamemenu_get_sound();
 }
-// 4A22D5: using guessed type char gbSoundOn;
 
 void __fastcall gamemenu_gamma(int a1)
 {
diff --git a/Source/loadsave.cpp b/Source/loadsave.cpp
index 9527ed2a5..9dd3c2c2e 100644
--- a/Source/loadsave.cpp
+++ b/Source/loadsave.cpp
@@ -169,7 +169,7 @@ void __fastcall LoadGame(BOOL firstflag)
 	missiles_process_charge();
 	ResetPal();
 	SetCursor(CURSOR_HAND);
-	gbProcessPlayers = 1;
+	gbProcessPlayers = TRUE;
 }
 // 5256A0: using guessed type int gbProcessPlayers;
 // 5BB1ED: using guessed type char leveltype;
diff --git a/Source/sound.cpp b/Source/sound.cpp
index a18c0eb16..ce528b697 100644
--- a/Source/sound.cpp
+++ b/Source/sound.cpp
@@ -17,7 +17,7 @@ const int sound_inf = 0x7F800000; // weak
 /* data */
 
 UCHAR gbMusicOn = 1;  // weak
-UCHAR gbSoundOn = 1;  // weak
+UCHAR gbSoundOn = TRUE;
 char gbDupSounds = 1; // weak
 int sgnMusicTrack = 6;
 char *sgszMusicTracks[NUM_MUSIC] = {
@@ -127,7 +127,6 @@ void __fastcall snd_play_snd(TSnd *pSnd, int lVolume, int lPan)
 
     pSnd->start_tc = tc;
 }
-// 4A22D5: using guessed type char gbSoundOn;
 
 LPDIRECTSOUNDBUFFER __fastcall sound_dup_channel(LPDIRECTSOUNDBUFFER DSB)
 {
@@ -258,8 +257,6 @@ void __fastcall snd_init(HWND hWnd)
 
     gbSndInited = sglpDS != NULL;
 }
-// 4A22D4: using guessed type char gbMusicOn;
-// 4A22D5: using guessed type char gbSoundOn;
 
 void __fastcall sound_load_volume(char *value_name, int *value)
 {