diff --git a/android/app/build.gradle b/android/app/build.gradle
index 18feaba8a..96f7149e8 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -15,8 +15,8 @@ android {
         }
         minSdkVersion 21
         targetSdkVersion 26
-        versionCode 226
-        versionName "0.6.8pre2"
+        versionCode 227
+        versionName "0.6.8"
         externalNativeBuild {
             cmake {
                 arguments "-DANDROID_APP_PLATFORM=android-21", "-DANDROID_STL=c++_static", "-DWARNINGS_ARE_ERRORS=ON", "-DWITH_LOCALE=ON", "-DUSE_MOMO=ON"
diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index e9703aeca..428f55847 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.tildearrow.furnace"
-    android:versionCode="226"
-    android:versionName="0.6.8pre2"
+    android:versionCode="227"
+    android:versionName="0.6.8"
     android:installLocation="auto">
 
     <!-- OpenGL ES 2.0 -->
diff --git a/papers/clipboard-format.md b/papers/clipboard-format.md
index 90f5a7a9b..70a908199 100644
--- a/papers/clipboard-format.md
+++ b/papers/clipboard-format.md
@@ -6,7 +6,7 @@ when copying pattern data from Furnace, it's stored in the clipboard as plain te
 org.tildearrow.furnace - Pattern Data (144)
 ```
 
-this top line of text is always the same except for the number in parentheses, which is the internal format version. for example, 0.6.8pre2 is `226`.
+this top line of text is always the same except for the number in parentheses, which is the internal format version. for example, 0.6.8 is `227`.
 
 the second line is a number between 0 and 18 (decimal) which indicates which column the clip starts from.
 - `0`: note.
diff --git a/papers/format.md b/papers/format.md
index c59cfee69..e4eaf7cdb 100644
--- a/papers/format.md
+++ b/papers/format.md
@@ -32,6 +32,7 @@ these fields are 0 in format versions prior to 100 (0.6pre1).
 
 the format versions are:
 
+- 227: Furnace 0.6.8
 - 226: Furnace 0.6.8pre2
 - 225: Furnace 0.6.8pre1
 - 219: Furnace 0.6.7
diff --git a/res/Info.plist b/res/Info.plist
index 0624225cb..3cb57209a 100644
--- a/res/Info.plist
+++ b/res/Info.plist
@@ -15,17 +15,17 @@
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleLongVersionString</key>
-	<string>0.6.8pre2</string>
+	<string>0.6.8</string>
 	<key>CFBundleName</key>
 	<string>Furnace</string>
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.6.8pre2</string>
+	<string>0.6.8</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>0.6.8pre2</string>
+	<string>0.6.8</string>
 	<key>NSHumanReadableCopyright</key>
 	<string></string>
 	<key>NSHighResolutionCapable</key>
diff --git a/res/furnace.rc b/res/furnace.rc
index 756507c87..717c31797 100644
--- a/res/furnace.rc
+++ b/res/furnace.rc
@@ -33,10 +33,10 @@
                 "Furnace"
 
             VALUE "ProductVersion",
-                "0.6.8pre2"
+                "0.6.8"
 
             VALUE "FileVersion",
-                "0.6.8pre2"
+                "0.6.8"
 
             VALUE "CompanyName",
                 "tildearrow"
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 94510d2f3..21fc9cebf 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -52,10 +52,10 @@ class DivWorkPool;
 #define EXTERN_BUSY_BEGIN_SOFT e->softLocked=true; e->isBusy.lock();
 #define EXTERN_BUSY_END e->isBusy.unlock(); e->softLocked=false;
 
-#define DIV_UNSTABLE
+//#define DIV_UNSTABLE
 
-#define DIV_VERSION "0.6.8pre2"
-#define DIV_ENGINE_VERSION 226
+#define DIV_VERSION "0.6.8"
+#define DIV_ENGINE_VERSION 227
 // for imports
 #define DIV_VERSION_MOD 0xff01
 #define DIV_VERSION_FC 0xff02
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index bc084bc37..2e78bc037 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -8581,6 +8581,9 @@ FurnaceGUI::FurnaceGUI():
   vibrator(NULL),
   vibratorAvailable(false),
   cv(NULL),
+  lastCVFrame(0),
+  cvFrameTime(100000),
+  cvFrameHold(0),
   sampleTex(NULL),
   sampleTexW(0),
   sampleTexH(0),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 88b5b079a..522a03804 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1628,6 +1628,8 @@ class FurnaceGUI {
 
   FurnaceCV* cv;
   FurnaceGUITexture* cvTex;
+  uint64_t lastCVFrame;
+  int cvFrameTime, cvFrameHold;
 
   FurnaceGUITexture* sampleTex;
   int sampleTexW, sampleTexH;
diff --git a/src/gui/tutorial.cpp b/src/gui/tutorial.cpp
index 25adc1820..9c1247e29 100644
--- a/src/gui/tutorial.cpp
+++ b/src/gui/tutorial.cpp
@@ -1011,6 +1011,9 @@ void FurnaceGUI::drawTutorial() {
         cv=new FurnaceCV;
         cv->init(e);
         cv->hiScore=cvHiScore;
+        lastCVFrame=SDL_GetPerformanceCounter();
+        cvFrameTime=100000;
+        cvFrameHold=0;
       }
       if (cvTex==NULL) {
         cvTex=rend->createTexture(true,320,224,false,bestTexFormat);
@@ -1056,7 +1059,16 @@ void FurnaceGUI::drawTutorial() {
         cv->e->setSongRate(cv->origSongRate*1.5);
       }
 
-      cv->render(touchControls);
+      uint64_t nextFrame=SDL_GetPerformanceCounter();
+      unsigned int mDivider=SDL_GetPerformanceFrequency()/1000000;
+      int delta=(nextFrame-lastCVFrame)/mDivider;
+      cvFrameTime=(cvFrameTime*15+delta)/16;
+      cvFrameHold+=delta;
+      if (cvFrameHold>=16667 || cvFrameTime>15000) {
+        cv->render(touchControls);
+        cvFrameHold%=16667;
+      }
+      lastCVFrame=nextFrame;
       
       if (cv->hiScore>cvHiScore) {
         cvHiScore=cv->hiScore;