diff --git a/engines/cryo/clsoundgroup.cpp b/engines/cryo/clsoundgroup.cpp
index 0d54b7d171d..9eb2ca691a3 100644
--- a/engines/cryo/clsoundgroup.cpp
+++ b/engines/cryo/clsoundgroup.cpp
@@ -33,7 +33,7 @@ soundgroup_t *CLSoundGroup_New(int16 numSounds, int16 length, int16 sampleSize,
 
 	for (int i = 0; i < sg->_numSounds; i++) {
 		sound_t *sound = CLSoundRaw_New(length, rate, sampleSize, mode);
-		sg->_sound[i] = sound;
+		sg->_sounds[i] = sound;
 		sound->_maxLength = length;
 	}
 	sg->_soundIndex = 0;
@@ -45,24 +45,24 @@ soundgroup_t *CLSoundGroup_New(int16 numSounds, int16 length, int16 sampleSize,
 
 void CLSoundGroup_Free(soundgroup_t *sg) {
 	for (int16 i = 0; i < sg->_numSounds; i++)
-		CLSoundRaw_Free(sg->_sound[i]);
+		CLSoundRaw_Free(sg->_sounds[i]);
 	free(sg);
 }
 
 void CLSoundGroup_Reverse16All(soundgroup_t *sg) {
 	for (int16 i = 0; i < sg->_numSounds; i++)
-		sg->_sound[i]->_reversed = true;
+		sg->_sounds[i]->_reversed = true;
 }
 
 void *CLSoundGroup_GetNextBuffer(soundgroup_t *sg) {
-	sound_t *sound = sg->_sound[sg->_soundIndex];
+	sound_t *sound = sg->_sounds[sg->_soundIndex];
 	if (sg->_forceWait)
 		while (sound->_locked) ;
 	return sound->sndHandle + sound->_headerLen;
 }
 
 bool CLSoundGroup_AssignDatas(soundgroup_t *sg, void *buffer, int length, bool isSigned) {
-	sound_t *sound = sg->_sound[sg->_soundIndex];
+	sound_t *sound = sg->_sounds[sg->_soundIndex];
 	if (sg->_forceWait)
 		while (sound->_locked) ;
 	else if (sound->_locked)
@@ -83,7 +83,7 @@ bool CLSoundGroup_AssignDatas(soundgroup_t *sg, void *buffer, int length, bool i
 }
 
 bool CLSoundGroup_SetDatas(soundgroup_t *sg, void *data, int length, bool isSigned) {
-	sound_t *sound = sg->_sound[sg->_soundIndex];
+	sound_t *sound = sg->_sounds[sg->_soundIndex];
 	if (length >= sound->_maxLength)
 		error("CLSoundGroup_SetDatas - Unexpected length");
 
@@ -110,7 +110,7 @@ bool CLSoundGroup_SetDatas(soundgroup_t *sg, void *data, int length, bool isSign
 }
 
 void CLSoundGroup_PlayNextSample(soundgroup_t *sg, soundchannel_t *ch) {
-	CLSoundChannel_Play(ch, sg->_sound[sg->_playIndex]);
+	CLSoundChannel_Play(ch, sg->_sounds[sg->_playIndex]);
 	if (sg->_playIndex == sg->_numSounds - 1)
 		sg->_playIndex = 0;
 	else
diff --git a/engines/cryo/cryo.cpp b/engines/cryo/cryo.cpp
index 6482e1c4133..220ba135246 100644
--- a/engines/cryo/cryo.cpp
+++ b/engines/cryo/cryo.cpp
@@ -39,7 +39,7 @@
 
 namespace Cryo {
 
-CryoEngine *g_ed = 0;
+CryoEngine *g_ed = nullptr;
 
 CryoEngine::CryoEngine(OSystem *syst, const ADGameDescription *gameDesc) : Engine(syst), _gameDescription(gameDesc), _console(nullptr) {
 	// Put your engine in a sane state, but do nothing big yet;
diff --git a/engines/cryo/cryolib.cpp b/engines/cryo/cryolib.cpp
index ff4a603bc49..961af6427c7 100644
--- a/engines/cryo/cryolib.cpp
+++ b/engines/cryo/cryolib.cpp
@@ -388,7 +388,7 @@ soundchannel_t *CLSoundChannel_New(int arg1) {
 	ch->_numSounds = 0;
 
 	for (int16 i = 0; i < kCryoMaxChSounds; i++)
-		ch->_sounds[i] = 0;
+		ch->_sounds[i] = nullptr;
 
 	return ch;
 }
diff --git a/engines/cryo/cryolib.h b/engines/cryo/cryolib.h
index 3bb4186fd78..7b7799ad2f2 100644
--- a/engines/cryo/cryolib.h
+++ b/engines/cryo/cryolib.h
@@ -149,7 +149,7 @@ typedef struct sound_t sound_t;
 #define kCryoMaxClSounds 64
 
 struct soundgroup_t {
-	sound_t *_sound[kCryoMaxClSounds];
+	sound_t *_sounds[kCryoMaxClSounds];
 	int16 _numSounds;
 	int16 _soundIndex;
 	int16 _playIndex;
diff --git a/engines/cryo/eden.cpp b/engines/cryo/eden.cpp
index 0362f0f80ca..5adacac664e 100644
--- a/engines/cryo/eden.cpp
+++ b/engines/cryo/eden.cpp
@@ -110,7 +110,7 @@ EdenGame::EdenGame(CryoEngine *vm) : _vm(vm) {
 	gameStarted = false;
 	_soundAllocated = false;
 	_musicChannel = _voiceChannel = nullptr;
-	hnmsound_ch = nullptr;
+	_hnmSoundChannel = nullptr;
 	voiceSound = nullptr;
 	p_view2 = p_underSubtitlesView = p_subtitlesview = p_underBarsView = p_mainview = p_hnmview = nullptr;
 	_hnmContext = nullptr;
@@ -5574,7 +5574,7 @@ void EdenGame::run() {
 	CLHNM_SetForceZero2Black(true);
 	CLHNM_SetupTimer(12.5);
 	voiceSound = CLSoundRaw_New(0, 11025 * 65536.0, 8, 0);
-	hnmsound_ch = CLHNM_GetSoundChannel();
+	_hnmSoundChannel = CLHNM_GetSoundChannel();
 	CLSound_SetWantsDesigned(1); // CHECKME: Used?
 
 	_musicChannel = new CSoundChannel(_vm->_mixer, 11025, false);
@@ -5677,19 +5677,19 @@ void EdenGame::edmain() {
 void EdenGame::intro() {
 	if (_vm->getPlatform() == Common::kPlatformMacintosh) {
 		// Play intro videos in HQ
-		CLSoundChannel_Stop(hnmsound_ch);
+		CLSoundChannel_Stop(_hnmSoundChannel);
 		CLHNM_CloseSound();
 		CLHNM_SetupSound(5, 0x2000, 16, 22050 * 65536.0, 0);
-		hnmsound_ch = CLHNM_GetSoundChannel();
+		_hnmSoundChannel = CLHNM_GetSoundChannel();
 		playHNM(2012);
 		playHNM(171);
 		CLBlitter_FillScreenView(0);
 		specialTextMode = false;
 		playHNM(2001);
-		CLSoundChannel_Stop(hnmsound_ch);
+		CLSoundChannel_Stop(_hnmSoundChannel);
 		CLHNM_CloseSound();
 		CLHNM_SetupSound(5, 0x2000, 8, 11025 * 65536.0, 0);
-		hnmsound_ch = CLHNM_GetSoundChannel();
+		_hnmSoundChannel = CLHNM_GetSoundChannel();
 	} else {
 		playHNM(98);	// Cryo logo
 		playHNM(171);	// Virgin logo
@@ -6211,8 +6211,8 @@ void EdenGame::showMovie(char arg1) {
 	CLHNM_ReadHeader(_hnmContext);
 	if (p_global->curVideoNum == 92) {
 		// _hnmContext->_header._unusedFlag2 = 0; CHECKME: Useless?
-		CLSoundChannel_SetVolumeLeft(hnmsound_ch, 0);
-		CLSoundChannel_SetVolumeRight(hnmsound_ch, 0);
+		CLSoundChannel_SetVolumeLeft(_hnmSoundChannel, 0);
+		CLSoundChannel_SetVolumeRight(_hnmSoundChannel, 0);
 	}
 	bool playing = true;
 	if (CLHNM_GetVersion(_hnmContext) != 4)
diff --git a/engines/cryo/eden.h b/engines/cryo/eden.h
index 8ab86640737..5f60c867f1e 100644
--- a/engines/cryo/eden.h
+++ b/engines/cryo/eden.h
@@ -646,7 +646,7 @@ private:
 
 	CSoundChannel *_musicChannel;
 	CSoundChannel *_voiceChannel;
-	soundchannel_t  *hnmsound_ch;
+	soundchannel_t *_hnmSoundChannel;
 	sound_t         *voiceSound;
 
 	View          *p_view2;