This is somewhat cleaner code flow. It's been re-tested.

src/include/drv/tRamp.c

@@ -120,30 +120,45 @@ RampParamUpdate( RampParamState* state )
             dxNow = dxLand;
     }
 
-    // update state
-    state->isRamping = !( dxNow == 0.0 && state->dxPrev == 0.0 );
-    if ( dxNow == dxReq )
-        state->val = state->req;
-    else if(dxNow != 0.0)
-    {
-        const double minprecision = 1.1103e-16;  //approx. minimum fraction of a
-                                                // double precision value that when added, changes that value
 
-        double minchange = lfabs(state->val)*minprecision;
+    //approx. minimum fraction of a double precision value that when added, changes that value
+    const double minprecision = 1.1103e-16;
+
+    //minimum change that will affect the current value (this is approximate, and can be bigger than the minimum change).
+    double minchange = lfabs(state->val)*minprecision;
+
+    if(dxNow != 0.0)
+    {
+        //handle the case where dxReq is smaller than our approx. minimum
         if(minchange > lfabs(dxReq))
         {
-            state->val = state->req;
             dxNow = dxReq;
         }
         else
         {
+            //otherwise, use the approx. minimum as a lower limit for our change.
             if(minchange > lfabs(dxNow))
             {
                 dxNow = dxNow > 0 ? minchange : -minchange;
             }
-            state->val += dxNow;
         }
     }
+
+
+    // update state
+    state->isRamping = !( dxNow == 0.0 && state->dxPrev == 0.0 );
+
+    //if close enough, just jump to the end
+    if ( lfabs(dxNow) > lfabs(dxReq))
+    {
+        state->val = state->req;
+        dxNow = dxReq;
+    }
+    else
+    {
+        state->val += dxNow;
+    }
+
     state->dxPrev = dxNow;
 
     return state->val;