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diff --git a/include/guttersynth.h b/include/guttersynth.h
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+/* 
+ * guttersynth.h
+ * Part of libguttersynth
+ * 
+ * Copyright Tom Mudd 2019, Richard Knight 2021, 2022
+ * 
+ * Ported to C by Richard Knight
+ * from https://github.com/tommmmudd/guttersynthesis by Tom Mudd
+ * 
+ */
+
+#ifndef GUTTER_H
+#define GUTTER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+// support for either single or double precision
+#ifndef FLT
+    
+#ifdef USE_FLOAT
+#define FLT float
+#else
+#define FLT double
+#endif
+   
+#endif
+    
+    
+// internal/private dcblock state variables
+typedef struct dcblock_session_ {
+    FLT xm1;
+    FLT ym1;
+    FLT r;
+} dcblock_session;
+
+// internal/private state variables
+typedef struct gutter_internal_ {
+    void (*dealloc)(void*);
+    int samplerate;
+    FLT finalY;
+    FLT duffX;
+    FLT duffY;
+    FLT dx;
+    FLT dy;
+    FLT t;
+    FLT* prevX1;
+    FLT* prevX2;
+    FLT* prevY1;
+    FLT* prevY2;
+    FLT* V;
+    FLT* K;
+    FLT* norm;
+    FLT* a0;
+    FLT* a1;
+    FLT* a2;
+    FLT* b1;
+    FLT* b2;
+    FLT* y;
+    dcblock_session dcblock;
+} gutter_internal;
+
+// state with public variables
+typedef struct gutter_state_ {
+    int bankCount;
+    int filterCount;
+
+    FLT gamma;
+    FLT omega;
+    FLT c;
+    FLT dt;
+    FLT singleGain;
+    FLT* gains;
+    FLT* filterFreqs;
+    FLT* Q;
+    int enableAudioInput;
+    int filtersOn;
+    int smoothing;
+    int distortionMethod;
+    gutter_internal gi;
+} gutter_state;
+
+
+// synthesise single sample with input
+FLT gutter_process_input(gutter_state* s, FLT audioInput);
+
+// synthesise single sample
+FLT gutter_process(gutter_state* s);
+
+// synthesise specified number of samples with input
+void gutter_process_input_samples(gutter_state* s, FLT* audioInput, FLT* audioOutput, int nsamps);
+
+// synthesise specified number of samples
+void gutter_process_samples(gutter_state* s, FLT* audioOutput, int nsamps);
+
+// reset state
+void gutter_reset(gutter_state* s);
+
+// clean up memory etc
+void gutter_cleanup(gutter_state* s);
+
+// calculate filter coefficients
+void gutter_calccoeffs(gutter_state* s);
+
+// initialise with custom memory allocator and deallocator
+gutter_state* gutter_init_ca(int bankCount, int filterCount, int samplerate, 
+    void* (*allocator)(size_t), void (*deallocator)(void*));
+
+// initialise with standard malloc and free
+gutter_state* gutter_init(int bankCount, int filterCount, int samplerate);
+
+// randomise filters
+void gutter_randomisefilters(gutter_state* s);
+
+// set distortion method
+int gutter_setdistortionmethod(gutter_state* s, int method);
+
+// set frequency of a filter in a bank
+int gutter_setfreq(gutter_state*, int bank, int filter, FLT value);
+
+// set Q of a filter in a bank
+int gutter_setq(gutter_state* s, int bank, int filter, FLT value);
+
+// set gain of a filter in a bank
+int gutter_setgain(gutter_state* s, int bank, int filter, FLT value);
+
+// set Q of all filters
+void gutter_setqall(gutter_state* s, FLT value);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GUTTER_H */
+