diff --git a/plugin/Makefile b/plugin/Makefile
index 2967e1e..23edd19 100644
--- a/plugin/Makefile
+++ b/plugin/Makefile
@@ -14,6 +14,7 @@ FILES_DSP = \
 	controls.cpp \
 	ic1.cpp \
 	oscillator.cpp \
+	filter.cpp \
 	ic29.cpp
 
 include ../dpf/Makefile.plugins.mk
diff --git a/plugin/ic29.cpp b/plugin/ic29.cpp
index 978aecb..90bc470 100644
--- a/plugin/ic29.cpp
+++ b/plugin/ic29.cpp
@@ -35,6 +35,15 @@ void Synth::buildTables(double sampleRate) {
         // on the real synth the tuning knob is tweaked a little off to pull it in
         pitchTable[i] = 260.15f * powf(2, (i - 36) / 12.0f) / sampleRate;
     }
+
+    // precompute a table of values to map the filter value to a filter coefficient
+    // the ROM preset for adjusting the VCF scale and centre presets cutoff to $31
+    // and key scale to $7f, which corresponds to C4 = 248Hz and C6 = 992Hz, B3 and B5
+
+    for (uint16_t i = 0; i< 256; i++) {
+
+
+    }
 }
 
 void Synth::run() {
diff --git a/plugin/ic29.hpp b/plugin/ic29.hpp
index fd940d3..f21951a 100644
--- a/plugin/ic29.hpp
+++ b/plugin/ic29.hpp
@@ -73,11 +73,13 @@ class Voice {
     Voice();
     uint8_t note = 0x3c;  // middle C
     void run(float *buffer, uint32_t pos, uint32_t samples);
+    void filter(float *buffer, uint32_t pos, uint32_t samples);
+
     void update();
     void on(uint8_t note);
     void off();
 
-   private:
+  // private:
     Envelope env;             // calculated envelope value
     uint16_t pitch = 0x1818;  // calculated pitch value with porta and master pitch etc
     float delay = 0;          // delay slot for polyblep
@@ -91,6 +93,8 @@ class Voice {
            V_ON } voiceState;
 
     void calcPitch();
+
+    float fb=0, b1=0, b2=0, b3=0, b4=0, cut=0.1, reso=4;
 };
 
 class Synth {
@@ -113,6 +117,7 @@ class Synth {
     int8_t portaCoeff;
     bool sustained;
     double pitchTable[104];
+    double filterTable[256];
 
     float *noise;
 
diff --git a/plugin/oscillator.cpp b/plugin/oscillator.cpp
index a3d7f07..83929b2 100644
--- a/plugin/oscillator.cpp
+++ b/plugin/oscillator.cpp
@@ -30,8 +30,7 @@ static inline float poly3blep1(float t) {
 void Voice::run(float *buffer, uint32_t pos, uint32_t samples) {
     // generate a full block of samples for the oscillator
 
-    float y, out, t;
-    float gain = env.level / 16384.0;
+    float y, t;
 
     if (subosc > 0) subosc = sub; else subosc = -sub;
 
@@ -71,9 +70,8 @@ void Voice::run(float *buffer, uint32_t pos, uint32_t samples) {
         delay += subosc;
         delay += ic29.noise[i+pos];
 
-        out = y * 0.15;
         lastpw = pwrc;
-        buffer[i + pos] += out * gain;
+        buffer[i + pos] = y * 0.707;
     }
 
 }
diff --git a/plugin/peacock.cpp b/plugin/peacock.cpp
index f1e2874..adb776d 100644
--- a/plugin/peacock.cpp
+++ b/plugin/peacock.cpp
@@ -29,8 +29,6 @@ Peacock::Peacock() : Plugin(paramCount, 0, 0), sampleRate(getSampleRate()) {
     ic29.bufferSize = getBufferSize();
 }
 
-
-
 void Peacock::runMidi(const MidiEvent *ev, uint32_t count, uint32_t timeLimit) {
     // handle MIDI events, starting at lastEvent and continuing until timeLimit
     uint32_t i;
@@ -52,7 +50,6 @@ void Peacock::initAudioPort(bool input, uint32_t index, AudioPort &port) {
     if (!input && index == 1) port.name = "Right Out";
 }
 
-
 void Peacock::run(const float **, float **outputs, uint32_t frames, const MidiEvent *midiEvents, uint32_t midiEventCount) {
     // calculate an entire jack period's worth of samples
     // harder than it sounds because for short jack periods there may be many
@@ -73,7 +70,7 @@ void Peacock::run(const float **, float **outputs, uint32_t frames, const MidiEv
     runMidi(midiEvents, midiEventCount, blockLeft);
 
     // generate a buffer's worth of samples
-    memset(outputs[0], 0, sizeof(float) * frames);
+    memset(outputs[1], 0, sizeof(float) * frames);
 
     while (framePos < frames) {
         if (blockLeft == 0) {
@@ -88,6 +85,10 @@ void Peacock::run(const float **, float **outputs, uint32_t frames, const MidiEv
         // run every synth voice into the buffer here FIXME
         for (uint8_t i = 0; i < NUM_VOICES; i++) {
             ic29.voices[i].run(outputs[0], framePos, sizeThisTime);
+            ic29.voices[i].filter(outputs[0], framePos, sizeThisTime);
+            for (uint8_t j=0; j<sizeThisTime; j++) {
+                outputs[1][framePos+j] += outputs[0][framePos+j] * ic29.voices[i].env.level/16384.0;
+            }
         }
 
         framePos += sizeThisTime;  // move along the frame
@@ -95,7 +96,7 @@ void Peacock::run(const float **, float **outputs, uint32_t frames, const MidiEv
         blockLeft -= sizeThisTime;
     }
     // output processing goes here
-    memcpy(outputs[1], outputs[0], sizeof(float) * frames);
+    memcpy(outputs[0], outputs[1], sizeof(float) * frames);
 }
 
 Plugin *createPlugin() { return new Peacock(); }