diff --git a/distrho/src/DistrhoPluginAU.cpp b/distrho/src/DistrhoPluginAU.cpp
index 7600f523..c31e9c08 100644
--- a/distrho/src/DistrhoPluginAU.cpp
+++ b/distrho/src/DistrhoPluginAU.cpp
@@ -164,15 +164,31 @@ public:
         return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
     }
 
-    void SetParameter(AudioUnitParameterID paramID,
+    void SetParameter(AudioUnitParameterID index,
                       AudioUnitParameterValue value) override
     {
-        fPlugin.setParameterValue(paramID, (float)value);
+        const uint32_t hints(fPlugin.getParameterHints(index));
+        const ParameterRanges& ranges(fPlugin.getParameterRanges(index));
+
+        if (hints & kParameterIsBoolean)
+        {
+            const float midRange = ranges.min + (ranges.max - ranges.min) / 2.0f;
+            value = value > midRange ? ranges.max : ranges.min;
+        }
+        else if (hints & kParameterIsInteger)
+        {
+            value = std::round(value);
+        }
+
+        fPlugin.setParameterValue(index, value);
+        //printf("SET: id=%d val=%f\n", index, value);
     }
 
-    AudioUnitParameterValue GetParameter(AudioUnitParameterID paramID) override
+    AudioUnitParameterValue GetParameter(AudioUnitParameterID index) override
     {
-        return fPlugin.getParameterValue(paramID);
+        AudioUnitParameterValue value = AUEffectBase::GetParameter(index);
+        //printf("GET: id=%d val=%f\n", index, value);
+        return value;
     }
 
     bool SupportsTail() override
@@ -199,6 +215,10 @@ public:
             destBuffer[i] = (Float32 *)outBuffer.mBuffers[i].mData;
         }
 
+        for (i = 0; i < fPlugin.getParameterCount(); i++) {
+            SetParameter(i, GetParameter(i));
+        }
+
         fPlugin.run((const float **)srcBuffer, (float **)destBuffer, inFramesToProcess);
 
         ioActionFlags &= ~kAudioUnitRenderAction_OutputIsSilence;