diff --git a/src/gba/sio/lockstep.c b/src/gba/sio/lockstep.c
index d9ffc783b..601236916 100644
--- a/src/gba/sio/lockstep.c
+++ b/src/gba/sio/lockstep.c
@@ -129,11 +129,7 @@ bool GBASIOLockstepNodeUnload(struct GBASIODriver* driver) {
 	default:
 		break;
 	}
-	if (node->id) {
-		node->p->signal(node->p, 1 << node->id);
-	} else {
-		node->p->addCycles(node->p, 0, node->eventDiff);
-	}
+	node->p->unload(node->p, node->id);
 	return true;
 }
 
diff --git a/src/gba/sio/lockstep.h b/src/gba/sio/lockstep.h
index e6e678982..797bb5859 100644
--- a/src/gba/sio/lockstep.h
+++ b/src/gba/sio/lockstep.h
@@ -31,6 +31,7 @@ struct GBASIOLockstep {
 	bool (*wait)(struct GBASIOLockstep*, unsigned mask);
 	void (*addCycles)(struct GBASIOLockstep*, int id, int32_t cycles);
 	int32_t (*useCycles)(struct GBASIOLockstep*, int id, int32_t cycles);
+	void (*unload)(struct GBASIOLockstep*, int id);
 	void* context;
 #ifndef NDEBUG
 	int transferId;
diff --git a/src/platform/qt/GameController.cpp b/src/platform/qt/GameController.cpp
index 833a3ce9a..f809093aa 100644
--- a/src/platform/qt/GameController.cpp
+++ b/src/platform/qt/GameController.cpp
@@ -50,6 +50,7 @@ GameController::GameController(QObject* parent)
 	, m_audioThread(new QThread(this))
 	, m_audioProcessor(AudioProcessor::create())
 	, m_pauseAfterFrame(false)
+	, m_sync(true)
 	, m_videoSync(VIDEO_SYNC)
 	, m_audioSync(AUDIO_SYNC)
 	, m_fpsTarget(-1)
@@ -938,10 +939,13 @@ void GameController::setTurbo(bool set, bool forced) {
 	if (m_turboForced && !forced) {
 		return;
 	}
-	if (m_turbo == set && m_turboForced == forced) {
+	if (m_turbo == set && m_turboForced == (set && forced)) {
 		// Don't interrupt the thread if we don't need to
 		return;
 	}
+	if (!m_sync) {
+		return;
+	}
 	m_turbo = set;
 	m_turboForced = set && forced;
 	enableTurbo();
@@ -954,25 +958,41 @@ void GameController::setTurboSpeed(float ratio) {
 
 void GameController::enableTurbo() {
 	threadInterrupt();
+	bool shouldRedoSamples = false;
 	if (!m_turbo) {
+		shouldRedoSamples = m_threadContext.sync.fpsTarget != m_fpsTarget;
 		m_threadContext.sync.fpsTarget = m_fpsTarget;
 		m_threadContext.sync.audioWait = m_audioSync;
 		m_threadContext.sync.videoFrameWait = m_videoSync;
 	} else if (m_turboSpeed <= 0) {
+		shouldRedoSamples = m_threadContext.sync.fpsTarget != m_fpsTarget;
 		m_threadContext.sync.fpsTarget = m_fpsTarget;
 		m_threadContext.sync.audioWait = false;
 		m_threadContext.sync.videoFrameWait = false;
 	} else {
+		shouldRedoSamples = m_threadContext.sync.fpsTarget != m_fpsTarget * m_turboSpeed;
 		m_threadContext.sync.fpsTarget = m_fpsTarget * m_turboSpeed;
 		m_threadContext.sync.audioWait = true;
 		m_threadContext.sync.videoFrameWait = false;
 	}
-	if (m_audioProcessor) {
+	if (m_audioProcessor && shouldRedoSamples) {
 		redoSamples(m_audioProcessor->getBufferSamples());
 	}
 	threadContinue();
 }
 
+void GameController::setSync(bool enable) {
+	m_turbo = false;
+	m_turboForced = false;
+	if (!enable) {
+		m_threadContext.sync.audioWait = false;
+		m_threadContext.sync.videoFrameWait = false;
+	} else {
+		m_threadContext.sync.audioWait = m_audioSync;
+		m_threadContext.sync.videoFrameWait = m_videoSync;
+	}
+	m_sync = enable;
+}
 void GameController::setAVStream(mAVStream* stream) {
 	threadInterrupt();
 	m_stream = stream;
diff --git a/src/platform/qt/GameController.h b/src/platform/qt/GameController.h
index c7e1fff7d..91d733e24 100644
--- a/src/platform/qt/GameController.h
+++ b/src/platform/qt/GameController.h
@@ -135,7 +135,8 @@ public slots:
 	void loadBackupState();
 	void saveBackupState();
 	void setTurbo(bool, bool forced = true);
-	void setTurboSpeed(float ratio = -1);
+	void setTurboSpeed(float ratio);
+	void setSync(bool);
 	void setAVStream(mAVStream*);
 	void clearAVStream();
 	void reloadAudioDriver();
@@ -197,6 +198,7 @@ private:
 	QAtomicInt m_pauseAfterFrame;
 	QList<std::function<void ()>> m_resetActions;
 
+	bool m_sync;
 	bool m_videoSync;
 	bool m_audioSync;
 	float m_fpsTarget;
diff --git a/src/platform/qt/MultiplayerController.cpp b/src/platform/qt/MultiplayerController.cpp
index 13a761539..91ec4beb5 100644
--- a/src/platform/qt/MultiplayerController.cpp
+++ b/src/platform/qt/MultiplayerController.cpp
@@ -56,9 +56,11 @@ MultiplayerController::MultiplayerController() {
 		if (!id) {
 			for (int i = 1; i < controller->m_players.count(); ++i) {
 				Player* player = &controller->m_players[i];
-				if (player->node->mode != controller->m_players[0].node->mode) {
+				if (player->node->d.p->mode != controller->m_players[0].node->d.p->mode) {
+					player->controller->setSync(true);
 					continue;
 				}
+				player->controller->setSync(false);
 				player->cyclesPosted += cycles;
 				if (player->awake < 1) {
 					player->node->nextEvent += player->cyclesPosted;
@@ -67,6 +69,7 @@ MultiplayerController::MultiplayerController() {
 				}
 			}
 		} else {
+			controller->m_players[id].controller->setSync(true);
 			controller->m_players[id].cyclesPosted += cycles;
 		}
 		controller->m_lock.unlock();
@@ -84,6 +87,31 @@ MultiplayerController::MultiplayerController() {
 		controller->m_lock.unlock();
 		return cycles;
 	};
+	m_lockstep.unload = [](GBASIOLockstep* lockstep, int id) {
+		MultiplayerController* controller = static_cast<MultiplayerController*>(lockstep->context);
+		controller->m_lock.lock();
+		Player* player = &controller->m_players[id];
+		if (id) {
+			player->controller->setSync(true);
+			player->waitMask &= ~(1 << id);
+			if (!player->waitMask && player->awake < 1) {
+				mCoreThreadStopWaiting(player->controller->thread());
+				player->awake = 1;
+			}
+		} else {
+			for (int i = 1; i < controller->m_players.count(); ++i) {
+				Player* player = &controller->m_players[i];
+				player->controller->setSync(true);
+				player->cyclesPosted += lockstep->players[0]->eventDiff;
+				if (player->awake < 1) {
+					player->node->nextEvent += player->cyclesPosted;
+					mCoreThreadStopWaiting(player->controller->thread());
+					player->awake = 1;
+				}
+			}
+		}
+		controller->m_lock.unlock();
+	};
 }
 
 MultiplayerController::~MultiplayerController() {