diff --git a/plugin.json b/plugin.json
index 97627b9..aac5c89 100644
--- a/plugin.json
+++ b/plugin.json
@@ -200,7 +200,8 @@
       "tags": [
         "Hardware clone", 
         "Mixer", 
-        "Stereo"
+        "Stereo",
+        "Polyphonic"
       ]
     }
   ]
diff --git a/res/STMix.svg b/res/STMix.svg
index 74bd338..52ac16d 100644
--- a/res/STMix.svg
+++ b/res/STMix.svg
@@ -25,9 +25,9 @@
      inkscape:pageshadow="2"
      inkscape:zoom="3.959798"
      inkscape:cx="95.397589"
-     inkscape:cy="410.81889"
+     inkscape:cy="380.51432"
      inkscape:document-units="mm"
-     inkscape:current-layer="components"
+     inkscape:current-layer="background"
      inkscape:document-rotation="0"
      showgrid="false"
      inkscape:window-width="2560"
@@ -96,7 +96,7 @@
        inkscape:export-filename="/home/diego/Escritorio/tirar kick all"
        inkscape:label="Layer 1"
        id="g73679"
-       transform="matrix(0.22493746,0,0,0.22493746,-41.377444,5.1830576)"
+       transform="matrix(0.22493746,0,0,0.22493746,-39.998259,5.1830576)"
        style="display:inline">
       <g
          id="g73681"
@@ -107,7 +107,7 @@
            style="fill:#ffffff">
           <polygon
              id="polygon73685"
-             points="606.316,298.069 640.94,298.069 640.94,259.056 537.067,259.056 537.067,362.929 640.94,362.929 640.94,328.304 606.315,328.304 571.691,328.304 571.691,305.222 571.691,289.29 606.315,289.29 "
+             points="640.94,259.056 537.067,259.056 537.067,362.929 640.94,362.929 640.94,328.304 606.315,328.304 571.691,328.304 571.691,305.222 571.691,289.29 606.315,289.29 606.316,298.069 640.94,298.069 "
              style="fill:#ffffff"
              transform="scale(1.0666667)" />
           <path
@@ -127,12 +127,12 @@
              style="fill:#ffffff;stroke-width:1.06667" />
           <polygon
              id="polygon73693"
-             points="272.366,311.113 294.698,289.29 294.698,259.056 190.825,259.056 190.825,289.29 253.516,289.29 231.128,310.993 254.394,332.696 190.825,332.696 190.825,362.929 294.698,362.929 294.698,332.696 "
+             points="294.698,259.056 190.825,259.056 190.825,289.29 253.516,289.29 231.128,310.993 254.394,332.696 190.825,332.696 190.825,362.929 294.698,362.929 294.698,332.696 272.366,311.113 294.698,289.29 "
              style="fill:#ffffff"
              transform="scale(1.0666667)" />
           <polygon
              id="polygon73695"
-             points="312.344,289.41 333.836,311.113 312.344,332.865 312.344,363.049 355.542,363.289 355.542,332.559 375.968,311.113 355.542,289.273 405.684,289.41 436.556,259.176 312.344,259.176 "
+             points="312.344,332.865 312.344,363.049 355.542,363.289 355.542,332.559 375.968,311.113 355.542,289.273 405.684,289.41 436.556,259.176 312.344,259.176 312.344,289.41 333.836,311.113 "
              style="fill:#ffffff"
              transform="scale(1.0666667)" />
         </g>
@@ -548,7 +548,7 @@
      inkscape:groupmode="layer"
      id="components"
      inkscape:label="components"
-     style="display:inline">
+     style="display:none">
     <g
        inkscape:export-ydpi="300"
        inkscape:export-xdpi="300"
diff --git a/src/Morphader.cpp b/src/Morphader.cpp
index dc0d5ee..d462331 100644
--- a/src/Morphader.cpp
+++ b/src/Morphader.cpp
@@ -179,8 +179,9 @@ struct Morphader : Module {
 					}
 					case AUDIO_MODE: {
 						// in audio mode, close to the centre point it is possible to get large voltages
-						// (e.g. if A and B are both 10V const), so clip
-						out[c / 4] = clamp(equalPowerCrossfade(inA, inB, channelCrossfades[i]), -12.f, +12.f);
+						// (e.g. if A and B are both 10V const). however according to the standard, it is 
+						// better not to clip this https://vcvrack.com/manual/VoltageStandards#Output-Saturation
+						out[c / 4] = equalPowerCrossfade(inA, inB, channelCrossfades[i]);
 						break;
 					}
 					default: assert(false);
diff --git a/src/STMix.cpp b/src/STMix.cpp
index ac86b34..731e747 100644
--- a/src/STMix.cpp
+++ b/src/STMix.cpp
@@ -1,9 +1,10 @@
 #include "plugin.hpp"
 
+using simd::float_4;
 
 struct STMix : Module {
 
-	// NOTE: not including auxilary channel
+	// NOTE: not including auxiliary channel
 	static const int numMixerChannels = 4;
 
 	enum ParamIds {
@@ -22,8 +23,8 @@ struct STMix : Module {
 		NUM_OUTPUTS
 	};
 	enum LightIds {
-		LEFT_LED,
-		RIGHT_LED,
+		ENUMS(LEFT_LED, 3),
+		ENUMS(RIGHT_LED, 3),
 		NUM_LIGHTS
 	};
 
@@ -32,27 +33,65 @@ struct STMix : Module {
 		for (int i = 0; i < numMixerChannels; ++i) {
 			configParam(GAIN_PARAM + i, 0.f, 1.f, 0.f, string::f("Gain %d", i + 1));
 		}
-
 	}
 
 	void process(const ProcessArgs& args) override {
-		float out[2] = {};
+		float_4 out_left[4] = {};
+		float_4 out_right[4] = {};
 
+		int numActivePolyphonyEngines = 1;
 		for (int i = 0; i < numMixerChannels + 1; ++i) {
+			const int stereoPolyChannels = std::max(inputs[LEFT_INPUT + i].getChannels(),
+			                                        inputs[RIGHT_INPUT + i].getChannels());
+			numActivePolyphonyEngines = std::max(numActivePolyphonyEngines, stereoPolyChannels);
+		}
+
+		for (int i = 0; i < numMixerChannels + 1; ++i) {
+
+			for (int c = 0; c < numActivePolyphonyEngines; c += 4) {
+				const float_4 in_left = inputs[LEFT_INPUT + i].getNormalPolyVoltageSimd<float_4>(0.f, c);
+				const float_4 in_right = inputs[RIGHT_INPUT + i].getNormalPolyVoltageSimd<float_4>(in_left, c);
 
-			const float in_left = inputs[LEFT_INPUT + i].getNormalVoltage(0.f);
-			const float in_right = inputs[RIGHT_INPUT + i].getNormalVoltage(in_left);
-			const float gain = (i < numMixerChannels) ? params[GAIN_PARAM + i].getValue() : 1.f;
+				const float gain = (i < numMixerChannels) ? params[GAIN_PARAM + i].getValue() : 1.f;
 
-			out[0] += in_left * gain;
-			out[1] += in_right * gain;
+				out_left[c / 4] += in_left * gain;
+				out_right[c / 4] += in_right * gain;
+			}
 		}
 
-		outputs[LEFT_OUTPUT].setVoltage(out[0]);
-		outputs[RIGHT_OUTPUT].setVoltage(out[1]);
+		outputs[LEFT_OUTPUT].setChannels(numActivePolyphonyEngines);
+		outputs[RIGHT_OUTPUT].setChannels(numActivePolyphonyEngines);
 
-		lights[LEFT_LED].setSmoothBrightness(outputs[LEFT_OUTPUT].getVoltage() / 5.f, args.sampleTime);
-		lights[RIGHT_LED].setSmoothBrightness(outputs[RIGHT_OUTPUT].getVoltage() / 5.f, args.sampleTime);
+		for (int c = 0; c < numActivePolyphonyEngines; c += 4) {
+			outputs[LEFT_OUTPUT].setVoltageSimd(out_left[c / 4], c);
+			outputs[RIGHT_OUTPUT].setVoltageSimd(out_right[c / 4], c);
+		}
+
+		if (numActivePolyphonyEngines == 1) {
+			lights[LEFT_LED + 0].setSmoothBrightness(outputs[LEFT_OUTPUT].getVoltage() / 5.f, args.sampleTime);
+			lights[RIGHT_LED + 0].setSmoothBrightness(outputs[RIGHT_OUTPUT].getVoltage() / 5.f, args.sampleTime);
+			lights[LEFT_LED + 1].setBrightness(0.f);
+			lights[RIGHT_LED + 1].setBrightness(0.f);
+			lights[LEFT_LED + 2].setBrightness(0.f);
+			lights[RIGHT_LED + 2].setBrightness(0.f);
+		}
+		else {
+			lights[LEFT_LED + 0].setBrightness(0.f);
+			lights[RIGHT_LED + 0].setBrightness(0.f);
+			lights[LEFT_LED + 1].setBrightness(0.f);
+			lights[RIGHT_LED + 1].setBrightness(0.f);
+
+			float b_left = 0.f;
+			float b_right = 0.f;
+			for (int c = 0; c < numActivePolyphonyEngines; c++) {
+				b_left += std::pow(out_left[c / 4][c % 4], 2);
+				b_right += std::pow(out_right[c / 4][c % 4], 2);
+			}
+			b_left = std::sqrt(b_left) / 5.f;
+			b_right = std::sqrt(b_right) / 5.f;
+			lights[LEFT_LED + 2].setSmoothBrightness(b_left, args.sampleTime);
+			lights[RIGHT_LED + 2].setSmoothBrightness(b_right, args.sampleTime);
+		}
 	}
 };
 
@@ -65,28 +104,28 @@ struct STMixWidget : ModuleWidget {
 		addChild(createWidget<Knurlie>(Vec(RACK_GRID_WIDTH, 0)));
 		addChild(createWidget<Knurlie>(Vec(RACK_GRID_WIDTH, RACK_GRID_HEIGHT - RACK_GRID_WIDTH)));
 
-		addParam(createParamCentered<Davies1900hWhiteKnob>(mm2px(Vec(20.892, 18.141)), module, STMix::GAIN_PARAM + 0));
-		addParam(createParamCentered<Davies1900hWhiteKnob>(mm2px(Vec(20.982, 41.451)), module, STMix::GAIN_PARAM + 1));
-		addParam(createParamCentered<Davies1900hWhiteKnob>(mm2px(Vec(20.927, 64.318)), module, STMix::GAIN_PARAM + 2));
+		addParam(createParamCentered<Davies1900hWhiteKnob>(mm2px(Vec(21.0, 18.141)), module, STMix::GAIN_PARAM + 0));
+		addParam(createParamCentered<Davies1900hWhiteKnob>(mm2px(Vec(21.0, 41.451)), module, STMix::GAIN_PARAM + 1));
+		addParam(createParamCentered<Davies1900hWhiteKnob>(mm2px(Vec(21.0, 64.318)), module, STMix::GAIN_PARAM + 2));
 		addParam(createParamCentered<Davies1900hWhiteKnob>(mm2px(Vec(21.0, 87.124)), module, STMix::GAIN_PARAM + 3));
 
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.308, 13.108)), module, STMix::LEFT_INPUT + 0));
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.308, 36.175)), module, STMix::LEFT_INPUT + 1));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 13.108)), module, STMix::LEFT_INPUT + 0));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 36.175)), module, STMix::LEFT_INPUT + 1));
 		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 59.243)), module, STMix::LEFT_INPUT + 2));
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.279, 82.311)), module, STMix::LEFT_INPUT + 3));
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.287, 105.378)), module, STMix::LEFT_INPUT + 4));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 82.311)), module, STMix::LEFT_INPUT + 3));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 105.378)), module, STMix::LEFT_INPUT + 4));
 
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.308, 23.108)), module, STMix::RIGHT_INPUT + 0));
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.313, 46.354)), module, STMix::RIGHT_INPUT + 1));
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.308, 69.237)), module, STMix::RIGHT_INPUT + 2));
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.308, 92.132)), module, STMix::RIGHT_INPUT + 3));
-		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.279, 115.379)), module, STMix::RIGHT_INPUT + 4));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 23.108)), module, STMix::RIGHT_INPUT + 0));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 46.354)), module, STMix::RIGHT_INPUT + 1));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 69.237)), module, STMix::RIGHT_INPUT + 2));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 92.132)), module, STMix::RIGHT_INPUT + 3));
+		addInput(createInputCentered<BefacoInputPort>(mm2px(Vec(6.3, 115.379)), module, STMix::RIGHT_INPUT + 4));
 
-		addOutput(createOutputCentered<BefacoOutputPort>(mm2px(Vec(23.813, 105.422)), module, STMix::LEFT_OUTPUT));
-		addOutput(createOutputCentered<BefacoOutputPort>(mm2px(Vec(23.792, 115.392)), module, STMix::RIGHT_OUTPUT));
+		addOutput(createOutputCentered<BefacoOutputPort>(mm2px(Vec(23.8, 105.422)), module, STMix::LEFT_OUTPUT));
+		addOutput(createOutputCentered<BefacoOutputPort>(mm2px(Vec(23.8, 115.392)), module, STMix::RIGHT_OUTPUT));
 
-		addChild(createLightCentered<MediumLight<RedLight>>(mm2px(Vec(16.8, 103.0)), module, STMix::LEFT_LED));
-		addChild(createLightCentered<MediumLight<RedLight>>(mm2px(Vec(16.8, 113.0)), module, STMix::RIGHT_LED));
+		addChild(createLightCentered<MediumLight<RedGreenBlueLight>>(mm2px(Vec(16.8, 103.0)), module, STMix::LEFT_LED));
+		addChild(createLightCentered<MediumLight<RedGreenBlueLight>>(mm2px(Vec(16.8, 113.0)), module, STMix::RIGHT_LED));
 	}
 };