diff --git a/Makefile b/Makefile
index f7934737..2b778bea 100755
--- a/Makefile
+++ b/Makefile
@@ -79,7 +79,7 @@ COMPINCLUDE = $(edirs) $(eddirs) $(pindirs) $(bsdirs)
 
 
 
-WARNING_FLAGS = #-Wall -Wwrite-strings -Wunsupported -Wall -Wextra -Wwrite-strings -Wno-unused-parameter -Wno-unused-function -Wno-missing-braces -Wno-incompatible-function-pointer-types -Wno-gnu-statement-expression -Wno-complex-component-init -pedantic
+WARNING_FLAGS = -Wno #-Wall -Wwrite-strings -Wunsupported -Wall -Wextra -Wwrite-strings -Wno-unused-parameter -Wno-unused-function -Wno-missing-braces -Wno-incompatible-function-pointer-types -Wno-gnu-statement-expression -Wno-complex-component-init -pedantic
 
 
 
diff --git a/source/engine/datastream.c b/source/engine/datastream.c
index c4b94cd4..95beabc6 100755
--- a/source/engine/datastream.c
+++ b/source/engine/datastream.c
@@ -11,6 +11,7 @@
 #include <stdlib.h>
 #include "mix.h"
 #include "limits.h"
+#include "iir.h"
 
 struct mShader *vid_shader;
 
@@ -90,7 +91,7 @@ void ds_openvideo(struct datastream *ds, const char *video, const char *adriver)
     fir->in = astream_filter;
 */
 
-    first_free_bus(hpf);
+    first_free_bus(astream_filter);
 
     plm_set_video_decode_callback(ds->plm, render_frame, ds);
     plm_set_audio_decode_callback(ds->plm, render_audio, ds);
diff --git a/source/engine/dsp.c b/source/engine/dsp.c
index bfeeb255..76259ac3 100644
--- a/source/engine/dsp.c
+++ b/source/engine/dsp.c
@@ -5,19 +5,42 @@
 #include "math.h"
 #include "stdlib.h"
 #include "iir.h"
+#include "log.h"
+#include "vec.h"
 
 #define PI 3.14159265
 
+struct vec filters;
+
 struct dsp_filter make_dsp(void *data, void (*in)(void *data, short *out, int n)) {
     struct dsp_filter new;
     new.data = data;
     new.filter = in;
+
+    if (filters.len == 0)
 }
 
 void dsp_run(struct dsp_filter filter, short *out, int n) {
+    filter.dirty = 1; // Always on for testing
+
+    if (!filter.dirty)
+        return;
+
+    for (int i = 0; i < filter.inputs; i++)
+        dsp_run(filter.in[i], out, n);
+
     filter.filter(filter.data, out, n);
 }
 
+struct dsp_filter_addin(struct dsp_filter filter, struct dsp_filter in)
+{
+    if (filter.inputs > 5) {
+        YughError("Too many inputs in filter.", 0);
+    }
+
+    filter.in[filter.inputs++] = in;
+}
+
 void am_mod(struct dsp_ammod *mod, short *c, int n)
 {
     dsp_run(mod->ina, mod->abuf, n);
@@ -133,9 +156,8 @@ void dsp_filter(short *in, short *out, int samples, struct dsp_delay *d)
 
 void dsp_rectify(short *in, short *out, int n)
 {
-    for (int i = 0; i < n; i++) {
+    for (int i = 0; i < n; i++)
         out[i] = abs(in[i]);
-    }
 }
 
 struct phasor phasor_make(unsigned int sr, float freq)
@@ -245,25 +267,27 @@ void gen_pinknoise(void *data, short *out, int n)
     */
 }
 
-short iir_filter(struct dsp_iir *iir, short val)
+short iir_filter(struct dsp_iir *miir, short val)
 {
+    struct dsp_iir iir = *miir;
+
     float a = 0.f;
 
-    iir->dx[0] = (float)val/SHRT_MAX;
-    for (int i = 0; i < iir->n; i++)
-        a += iir->ccof[i] * iir->dx[i];
+    iir.dx[0] = (float)val/SHRT_MAX;
+    for (int i = 0; i < iir.n; i++)
+        a += iir.ccof[i] * iir.dx[i];
 
-    for (int i = iir->n-1; i > 0; i--)
-        iir->dx[i] = iir->dx[i-1];
+    for (int i = iir.n-1; i > 0; i--)
+        iir.dx[i] = iir.dx[i-1];
 
 
-    for (int i =0; i < iir->n; i++)
-        a -= iir->dcof[i] * iir->dy[i];
+    for (int i =0; i < iir.n; i++)
+        a -= iir.dcof[i] * iir.dy[i];
 
-    iir->dy[0] = a;
+    iir.dy[0] = a;
 
-    for (int i = iir->n-1; i > 0; i--)
-        iir->dy[i] = iir->dy[i-1];
+    for (int i = iir.n-1; i > 0; i--)
+        iir.dy[i] = iir.dy[i-1];
 
 
 
@@ -283,46 +307,31 @@ void dsp_iir_fillbuf(struct dsp_iir *iir, short *out, int n)
     }
 }
 
-struct dsp_iir new_iir(int poles, float freq)
-{
-    struct dsp_iir new;
-    new.poles = poles;
-    new.freq = freq;
-    new.n = new.poles+1;
-    new.ccof = malloc(new.n*sizeof(float));
-    new.dcof = malloc(new.n*sizeof(float));
-    new.dy = malloc(new.n*sizeof(float));
-    new.dx = malloc(new.n*sizeof(float));
-    return new;
-}
-
 struct dsp_filter lpf_make(int poles, float freq)
 {
     struct dsp_iir *new = malloc(sizeof(*new));
-    *new = new_iir(poles, freq);
+    (*new) = make_iir(3, 1);
 
   double fcf = new->freq*2/SAMPLERATE;
+
   double sf = sf_bwlp(poles, fcf);
 
   printf("Making LPF filter, fcf: %f, coeffs: %i, scale %1.15lf\n", fcf, new->n, sf);
 
-  int *ccof = ccof_bwlp(new->poles);
-  double *dcof = dcof_bwlp(new->poles, fcf);
+  int *ccof = ccof_bwlp(new->n);
+  new->dcof = dcof_bwlp(new->n, fcf);
 
-  for (int i = 0; i < new->n; i++) {
-      new->ccof[i] = ccof[i] * sf;
-      new->dcof[i] = dcof[i];
-  }
+  for (int i = 0; i < new->n; i++)
+      new->ccof[i] = (float)ccof[i] * sf;
 
   new->dcof[0] = 0.f;
 
   free(ccof);
-  free(dcof);
 
   printf("LPF coefficients are:\n");
 
   for (int i = 0; i < new->n; i++) {
-      printf("%f, %f\n", new->ccof[i], new->dcof[i]);
+      YughInfo("%f, %f\n", new->ccof[i], new->dcof[i]);
   }
 
   struct dsp_filter lpf;
@@ -335,25 +344,22 @@ struct dsp_filter lpf_make(int poles, float freq)
 struct dsp_filter hpf_make(int poles, float freq)
 {
   struct dsp_iir *new = malloc(sizeof(*new));
-  *new = new_iir(poles, freq);
+  *new = make_iir(3, 1);
 
   double fcf = new->freq*2/SAMPLERATE;
-  double sf = sf_bwhp(new->poles, fcf);
+  double sf = sf_bwhp(new->n, fcf);
 
-  int *ccof = ccof_bwhp(new->poles);
-  double *dcof = dcof_bwhp(new->poles, fcf);
+  int *ccof = ccof_bwhp(new->n);
+  new->dcof = dcof_bwhp(new->n, fcf);
 
-  for (int i = 0; i < new->n; i++) {
+  for (int i = 0; i < new->n; i++)
       new->ccof[i] = ccof[i] * sf;
-      new->dcof[i] = dcof[i];
-  }
 
     for (int i = 0; i < new->n; i++) {
       printf("%f, %f\n", new->ccof[i], new->dcof[i]);
   }
 
   free(ccof);
-  free(dcof);
 
   struct dsp_filter hpf;
   hpf.data = new;
diff --git a/source/engine/dsp.h b/source/engine/dsp.h
index 7c83fbeb..70787790 100644
--- a/source/engine/dsp.h
+++ b/source/engine/dsp.h
@@ -14,19 +14,12 @@ void dsp_rectify(short *in, short *out, int n);
 struct dsp_filter {
     void (*filter)(void *data, short *out, int samples);
     void *data;
-};
 
-struct dsp_iir {
-    float freq;
-    int poles;
-    int n;  // Amount of constants
-    int order;  // How many times it's applied
-    float *ccof;
-    float *dcof;
-    float *dx;
-    float *dy;
+    int inputs;
+    struct dsp_filter *in[6];
 
-    struct dsp_filter in;
+    short cache[CHANNELS*SAMPLERATE];
+    int dirty;
 };
 
 struct dsp_fir {
@@ -39,6 +32,8 @@ struct dsp_fir {
     struct dsp_filter in;
 };
 
+void dsp_filter_addin(struct dsp_filter filter, struct dsp_filter in);
+
 struct dsp_filter lp_fir_make(float freq);
 
 void dsp_iir_fillbuf(struct dsp_iir *iir, short *out, int n);
diff --git a/source/engine/iir.c b/source/engine/iir.c
index 834e0b51..f49e7a87 100644
--- a/source/engine/iir.c
+++ b/source/engine/iir.c
@@ -43,6 +43,35 @@
 #include "limits.h"
 #include "iir.h"
 #include "dsp.h"
+#include "log.h"
+
+struct dsp_iir make_iir(int cofs, int order)
+{
+    struct dsp_iir new;
+    new.dcof = calloc(sizeof(float), cofs * order);
+    new.ccof = calloc(sizeof(float), cofs * order);
+    new.dx = calloc(sizeof(float), cofs * order);
+    new.dy = calloc(sizeof(float), cofs * order);
+    new.order = order;
+    new.n = cofs;
+
+    return new;
+}
+
+
+struct dsp_iir biquad_iir()
+{
+    struct dsp_iir new = make_iir(3, 1);
+    return new;
+}
+
+struct dsp_iir p2_iir_order(int order)
+{
+    struct dsp_iir new = make_iir(3, order);
+    new.order = order;
+
+    return new;
+}
 
 /**********************************************************************
   binomial_mult - multiplies a series of binomials together and returns
@@ -641,26 +670,105 @@ float *fir_bpf(int n, double fcf1, double fcf2)
 
 
 
+struct dsp_iir sp_lp(double fcf)
+{
+    struct dsp_iir new = make_iir(2, 1);
+    double x = exp(-2*M_PI*fcf);
 
+    new.ccof[0] = 1 - x;
+    new.ccof[1] = 0.f;
 
+    new.dcof[0] = 0.f;
+    new.dcof[1] = x;
+
+    return new;
+}
+
+struct dsp_iir sp_hp(double fcf)
+{
+    struct dsp_iir new = make_iir(2, 1);
+    double x = exp(-2*M_PI*fcf);
+
+    new.ccof[0] = (1 + x)/2;
+    new.ccof[1] = -new.ccof[0];
+
+    new.dcof[0] = 0.f;
+    new.dcof[1] = x;
+
+    return new;
+}
+
+/* http://www.dspguide.com/ch19/3.htm */
+struct dsp_iir sp_bp(double fcf, double bw)
+{
+    double R = 1 - 3*bw;
+    double K = (1 - 2*R*cos(2*M_PI*fcf)+pow(R, 2)) / (2 - 2*cos(2*M_PI*fcf));
+
+    struct dsp_iir new = make_iir(3, 1);
+
+    new.ccof[0] = 1-K;
+    new.ccof[1] = 2*(K-R)*cos(2*M_PI*fcf);
+    new.ccof[2] = pow(R, 2) - K;
+
+    new.dcof[0] = 0.f;
+    new.dcof[1] = 2*R*cos(2*M_PI*fcf);
+    new.dcof[2] = -1 * pow(R, 2);
+
+    return new;
+}
+
+struct dsp_iir sp_notch(double fcf, double bw)
+{
+    double R = 1 - 3*bw;
+    double K = (1 - 2*R*cos(2*M_PI*fcf)+pow(R, 2)) / (2 - 2*cos(2*M_PI*fcf));
+
+    struct dsp_iir new = make_iir(3, 1);
+
+    new.ccof[0] = K;
+    new.ccof[1] = -2*K*cos(2*M_PI*fcf);
+    new.ccof[2] = K;
+
+    new.dcof[0] = 0.f;
+    new.dcof[1] = 2*R*cos(2*M_PI*fcf);
+    new.dcof[2] = -1 * pow(R, 2);
+
+    return new;
+}
+
+double chevy_pct_to_e(double pct)
+{
+    if (pct > 0.292 || pct < 0) {
+        YughWarn("Gave a percentage out of range. Should be between 0.0 and 0.292 to get a proper value. Gave %f.", pct);
+        pct = pct > 0.292 ? 0.292 : 0.f;
+    }
+
+    double e = pow(1/(1-pct), 2) - 1;
+
+    return e;
+}
+
+/* Four stage single pole low pass, similar to gauss */
+/* http://www.dspguide.com/ch19/2.htm */
+struct dsp_iir sp_lp_gauss(double fcf)
+{
+    struct dsp_iir new = make_iir(5, 1);
+    double x = exp(-14.445*fcf);
+
+    new.ccof[0] = pow((1 - x), 4);
+
+    new.dcof[0] = 0.f;
+    new.dcof[1] = 4*x;
+    new.dcof[2] = -6 * pow(x, 2);
+    new.dcof[3] = 4 * pow(x, 3);
+    new.dcof[4] = -1 * pow(x,4);
+
+    return new;
+}
 
 
 
 
 /* Biquad filters */
-
-struct dsp_iir biquad_iir()
-{
-    struct dsp_iir new;
-    new.dcof = malloc(sizeof(float) * 3);
-    new.ccof = malloc(sizeof(float) * 3);
-    new.dx = malloc(sizeof(float) * 3);
-    new.dy = malloc(sizeof(float) * 3);
-    new.n = 3;
-    new.poles = 2;
-    return new;
-}
-
 void biquad_iir_fill(struct dsp_iir bq, double *a, double *b)
 {
     bq.ccof[0] = (b[0] / a[0]);
@@ -843,7 +951,7 @@ void p2_ccalc(double fcf, double p, double g, double *a, double *b)
     double w0 = tan(M_PI * fcf);
     double k[2];
     k[0] = p * w0;
-    k[1] = g * pow2(w0);
+    k[1] = g * pow(w0, 2);
 
     a[0] = k[1] / (1 + k[0] + k[1]);
     a[1] = 2 * a[0];
@@ -913,19 +1021,7 @@ struct dsp_iir p2_beshp(double fcf)
     return new;
 }
 
-struct dsp_iir p2_iir_order(int order)
-{
-    struct dsp_iir new;
-    new.n = 3;
-    new.order = order;
 
-    new.ccof = calloc(sizeof(float), 3 * order);
-    new.dcof = calloc(sizeof(float), 3 * order);
-    new.dx = calloc(sizeof(float), 3 * order);
-    new.dy = calloc(sizeof(float), 3 * order);
-
-    return new;
-}
 
 short p2_filter(struct dsp_iir iir, short val)
 {
@@ -963,8 +1059,8 @@ struct dsp_iir che_lp(int order, double fcf, double e)
 
 
     double a = tan(M_PI * fcf);
-    double a2 = pow2(a);
-    double u = log((1.f + sqrt(1.f + pow2(e)))/e);
+    double a2 = pow(a, 2);
+    double u = log((1.f + sqrt(1.f + pow(e, 2)))/e);
     double su = sinh(u/new.order);
     double cu = cosh(u/new.order);
     double b, c, s;
@@ -974,7 +1070,7 @@ struct dsp_iir che_lp(int order, double fcf, double e)
     {
         b = sin(M_PI * (2.f*i + 1.f)/(2.f*new.order)) * su;
         c = cos(M_PI * (2.f*i + 1.f)/(2.f*new.order)) * cu;
-        c = pow2(b) + pow2(c);
+        c = pow(b, 2) + pow(c, 2);
         s = a2*c + 2.f*a*b + 1.f;
         double A = a2/(4.f);
 
@@ -995,8 +1091,8 @@ struct dsp_iir che_hp(int order, double fcf, double e)
     struct dsp_iir new = che_lp(order, fcf, e);
 
     double a = tan(M_PI * fcf);
-    double a2 = pow2(a);
-    double u = log((1.f + sqrt(1.f + pow2(e)))/e);
+    double a2 = pow(a, 2);
+    double u = log((1.f + sqrt(1.f + pow(e, 2)))/e);
     double su = sinh(u/new.order);
     double cu = cosh(u/new.order);
     double b, c, s;
@@ -1006,7 +1102,7 @@ struct dsp_iir che_hp(int order, double fcf, double e)
     {
         b = sin(M_PI * (2.f*i + 1.f)/(2.f*new.order)) * su;
         c = cos(M_PI * (2.f*i + 1.f)/(2.f*new.order)) * cu;
-        c = pow2(b) + pow2(c);
+        c = pow(b, 2) + pow(c, 2);
         s = a2*c + 2.f*a*b + 1.f;
         double A = 1.f/(4.f);
 
@@ -1020,31 +1116,32 @@ struct dsp_iir che_hp(int order, double fcf, double e)
     return new;
 }
 
-struct dsp_iir che_bp(int order, double fcf1, double fcf2, double e)
+struct dsp_iir che_bp(int order, double s, double fcf1, double fcf2, double e)
 {
-        struct dsp_iir new = p2_iir_order(order);
+        struct dsp_iir new = make_iir(5, order);
 
-        double a = cos(M_PI*(fcf1+fcf2)/2) / cos(M_PI*(fcf2-fcf1));
-        double a2 = pow2(a);
-        double b = tan(M_PI*(fcf2-fcf1));
-        double b2 = pow2(b);
-        double u = log((1.f+sqrt(1.f+pow2(e)))/e);
+        double a = cos(M_PI*(fcf1+fcf2)/s) / cos(M_PI*(fcf2-fcf1)/s);
+        double a2 = pow(a, 2);
+        double b = tan(M_PI*(fcf2-fcf1)/s);
+        double b2 = pow(b, 2);
+        double u = log((1.f+sqrt(1.f+pow(e, 2)))/e);
         double su = sinh(2.f*u/new.order);
         double cu = cosh(2.f*u/new.order);
         double A = b2/(4.f);
-        double r, c, s;
+        double r, c;
+        double ep = 2.f/e;
 
         for (int i = 0; i < new.order; ++i) {
             r = sin(M_PI*(2.f*i+1.f)/new.order)*su;
             c = cos(M_PI*(2.f*i+1.f)/new.order)*su;
-            c = pow2(r) + pow2(c);
+            c = pow(r, 2) + pow(c, 2);
             s = b2*c + 2.f*b*r + 1.f;
 
             new.ccof[0*i] = ep * 1.f/A;
             new.ccof[1*i] = ep * -2.f/A;
             new.ccof[2*i] = ep * 1.f/A;
 
-            new.ddof[0*i] = 0.f;
+            new.dcof[0*i] = 0.f;
             new.dcof[1*i] = ep * 4.f*a*(1.f+b*r)/s;
             new.dcof[2*i] = ep * 2.f*(b2*c-2.f*a2-1.f)/s;
             new.dcof[3*i] = ep * 4.f*a*(1.f-b*r)/s;
@@ -1054,31 +1151,32 @@ struct dsp_iir che_bp(int order, double fcf1, double fcf2, double e)
         return new;
 }
 
-struct dsp_iir che_notch(int order, double fcf1, double fcf2, double e)
+struct dsp_iir che_notch(int order, double s, double fcf1, double fcf2, double e)
 {
-    struct dsp_iir new = p2_iir_order(order);
+    struct dsp_iir new = make_iir(5, order);
 
-    double a = cos(M_PI*(fcf1+fcf2)/2) / cos(M_PI*(fcf2-fcf1));
-    double a2 = pow2(a);
-    double b = tan(M_PI*(fcf2-fcf1));
-    double b2 = pow2(b);
-    double u = log((1.f+sqrt(1.f+pow2(e)))/e);
-    double su = sinh(2.f*u/n);
-    double cu = cosh(2.f*u/n);
+    double a = cos(M_PI*(fcf1+fcf2)/s) / cos(M_PI*(fcf2-fcf1)/s);
+    double a2 = pow(a, 2);
+    double b = tan(M_PI*(fcf2-fcf1)/s);
+    double b2 = pow(b, 2);
+    double u = log((1.f+sqrt(1.f+pow(e, 2)))/e);
+    double su = sinh(2.f*u/new.n);
+    double cu = cosh(2.f*u/new.n);
     double A = b2/(4.f*s);
-    double r, c, s;
+    double r, c;
+    double ep = 2.f/e;
 
     for (int i = 0; i < new.order; ++i) {
         r = sin(M_PI*(2.f*i+1.f)/new.order)*su;
-        c = cos(M_PI*(2.f*i+1.f)/ew.order)*su;
-        c = pow2(r) + pow2(c);
+        c = cos(M_PI*(2.f*i+1.f)/new.order)*su;
+        c = pow(r, 2) + pow(c, 2);
         s = b2*c + 2.f*b*r + 1.f;
 
         new.ccof[0*i] = ep * 1.f/A;
         new.ccof[1*i] = ep * -2.f/A;
         new.ccof[2*i] = ep * 1.f/A;
 
-        new.ddof[0*i] = 0.f;
+        new.dcof[0*i] = 0.f;
         new.dcof[1*i] = ep * 4.f*a*(c+b*r)/s;
         new.dcof[2*i] = ep * 2.f*(b2-2.f*a2*c-c)/s;
         new.dcof[3*i] = ep * 4.f*a*(c-b*r)/s;
diff --git a/source/engine/iir.h b/source/engine/iir.h
index 95a3aff4..c30bdbd5 100644
--- a/source/engine/iir.h
+++ b/source/engine/iir.h
@@ -1,6 +1,22 @@
 #ifndef IIR_H
 #define IIR_H
 
+#include "dsp.h"
+
+struct dsp_iir {
+    float freq;
+    int n;  // Amount of constants
+    int order;  // How many times it's applied
+    float *ccof;
+    float *dcof;
+    float *dx;
+    float *dy;
+
+    struct dsp_filter in;
+};
+
+struct dsp_iir make_iir(int cofs, int order);
+
 double *binomial_mult( int n, double *p );
 double *trinomial_mult( int n, double *b, double *c );
 
@@ -23,6 +39,11 @@ float *fir_lp(int n, double fcf);
 float *fir_hp(int n, double fcf);
 float *fir_bpf(int n, double fcf1, double fcf2);
 
+struct dsp_iir sp_lp(double fcf);
+struct dsp_iir sp_hp(double fcf);
+
+double chevy_pct_to_e(double pct);
+
 struct dsp_iir bqlp_dcof(double fcf, float Q);
 struct dsp_iir bqhp_dcof(double fcf, float Q);
 struct dsp_iir bqbpq_dcof(double fcf, float Q);
@@ -42,7 +63,7 @@ struct dsp_iir p2_beshp(double fcf);
 
 struct dsp_iir che_lp(int order, double fcf, double e);
 struct dsp_iir che_hp(int order, double fcf, double e);
-struct dsp_iir che_bp(int order, double fcf1, double fcf2, double e);
-struct dsp_iir che_notch(int order, double fcf1, double fcf2, double e);
+struct dsp_iir che_bp(int order, double s, double fcf1, double fcf2, double e);
+struct dsp_iir che_notch(int order, double s, double fcf1, double fcf2, double e);
 
 #endif
diff --git a/source/engine/sound.c b/source/engine/sound.c
index 8a3a4869..5e87bd00 100755
--- a/source/engine/sound.c
+++ b/source/engine/sound.c
@@ -16,6 +16,9 @@
 #define TSF_IMPLEMENTATION
 #include "tsf.h"
 
+#define TML_IMPLEMENTATION
+#include "tml.h"
+
 
 #define DR_WAV_IMPLEMENTATION
 #include "dr_wav.h"
@@ -222,6 +225,9 @@ void sound_init()
 
 
 
+
+    tsf *tsf_load_filename("sounds/ff7.sf2");
+    tml_message *tml_load_filename("sounds/one_winged_angel.mid");
 }
 
 void audio_open(const char *device)