diff --git a/src/engine/filter.cpp b/src/engine/filter.cpp
index 5c8ab218e..25d581b5a 100644
--- a/src/engine/filter.cpp
+++ b/src/engine/filter.cpp
@@ -26,6 +26,7 @@ float* DivFilterTables::cubicTable=NULL;
 float* DivFilterTables::sincTable=NULL;
 float* DivFilterTables::sincTable8=NULL;
 float* DivFilterTables::sincIntegralTable=NULL;
+float* DivFilterTables::sincIntegralSmallTable=NULL;
 
 // portions from Schism Tracker (scripts/lutgen.c)
 // licensed under same license as this program.
@@ -106,3 +107,25 @@ float* DivFilterTables::getSincIntegralTable() {
   }
   return sincIntegralTable;
 }
+
+float* DivFilterTables::getSincIntegralSmallTable() {
+  if (sincIntegralSmallTable==NULL) {
+    logD("initializing small sinc integral table.");
+    sincIntegralSmallTable=new float[256];
+
+    sincIntegralSmallTable[0]=-0.5f;
+    for (int i=1; i<256; i++) {
+      int mapped=((i&31)<<3)|(i>>5);
+      int mappedPrev=(((i-1)&31)<<3)|((i-1)>>5);
+      double x=(double)i*M_PI/32.0;
+      double sinc=sin(x)/x;
+      sincIntegralSmallTable[mapped]=sincIntegralSmallTable[mappedPrev]+(sinc/32.0);
+    }
+
+    for (int i=0; i<256; i++) {
+      int mapped=((i&31)<<3)|(i>>5);
+      sincIntegralSmallTable[mapped]*=pow(cos(M_PI*(double)i/512.0),2.0);
+    }
+  }
+  return sincIntegralSmallTable;
+}
\ No newline at end of file
diff --git a/src/engine/filter.h b/src/engine/filter.h
index 1e6597e4f..1406ee145 100644
--- a/src/engine/filter.h
+++ b/src/engine/filter.h
@@ -23,6 +23,7 @@ class DivFilterTables {
     static float* sincTable;
     static float* sincTable8;
     static float* sincIntegralTable;
+    static float* sincIntegralSmallTable;
 
     /**
      * get a 1024x4 cubic spline table.
@@ -47,4 +48,10 @@ class DivFilterTables {
      * @return the table.
      */
     static float* getSincIntegralTable();
+
+    /**
+     * get a 32x8 one-side sine-windowed sinc integral table.
+     * @return the table.
+     */
+    static float* getSincIntegralSmallTable();
 };
\ No newline at end of file
diff --git a/src/gui/osc.cpp b/src/gui/osc.cpp
index d2f62910e..4a12ff34c 100644
--- a/src/gui/osc.cpp
+++ b/src/gui/osc.cpp
@@ -55,7 +55,7 @@ void FurnaceGUI::readOsc() {
       oscValues[ch]=new float[1024];
     }
     memset(oscValues[ch],0,1024*sizeof(float));
-    float* sincITable=DivFilterTables::getSincIntegralTable();
+    float* sincITable=DivFilterTables::getSincIntegralSmallTable();
 
     float posFrac=0.0;
     float factor=(float)oscWidth/(float)winSize;
@@ -67,11 +67,11 @@ void FurnaceGUI::readOsc() {
 
       posFrac+=1.0;
       while (posFrac>=1.0) {
-        unsigned int n=((unsigned int)(posFrac*8192.0))&8191;
+        unsigned int n=((unsigned int)(posFrac*32.0))&31;
         posFrac-=factor;
         posInt++;
 
-        float* t1=&sincITable[(8191-n)<<3];
+        float* t1=&sincITable[(31-n)<<3];
         float* t2=&sincITable[n<<3];
         float delta=e->oscBuf[ch][posInt&0x7fff]-e->oscBuf[ch][(posInt-1)&0x7fff];