diff --git a/source/engine/datastream.c b/source/engine/datastream.c
index cea9a5f..95beabc 100755
--- a/source/engine/datastream.c
+++ b/source/engine/datastream.c
@@ -91,7 +91,7 @@ void ds_openvideo(struct datastream *ds, const char *video, const char *adriver)
     fir->in = astream_filter;
 */
 
-    //first_free_bus(astream_filter);
+    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 9c51135..504cf80 100644
--- a/source/engine/dsp.c
+++ b/source/engine/dsp.c
@@ -54,6 +54,11 @@ void am_mod(struct dsp_ammod *mod, short *c, int n)
         c[i] = (mod->abuf[i]*mod->bbuf[i])>>15;
 }
 
+void fm_mod(float *in1, float *in2, float *out, int n)
+{
+
+}
+
 static struct wav make_wav(float freq, int sr, int ch) {
     struct wav new;
     new.ch = ch;
@@ -185,13 +190,6 @@ float phasor_step(struct phasor *p)
     p->cur += p->freq/p->sr;
     if (p->cur >= 1.f) p->cur = 0.f;
     return p->cur;
-
-/*
-    float ret = p->cache[p->cstep++];
-    if (p->cstep ==p->clen) p->cstep = 0;
-
-    return ret;
-    */
 }
 
 float sin_phasor(float p)
@@ -517,4 +515,14 @@ struct dsp_filter make_adsr(unsigned int atk, unsigned int dec, unsigned int sus
     adsr->rls_t = tau2pole(rls / 3000.f);
 
     return make_dsp(adsr, dsp_adsr_fillbuf);
+}
+
+struct dsp_filter make_reverb()
+{
+
+}
+
+void dsp_reverb_fillbuf(struct dsp_reverb *r, short *out, int n)
+{
+
 }
\ No newline at end of file
diff --git a/source/engine/dsp.h b/source/engine/dsp.h
index 79dbcee..f388938 100644
--- a/source/engine/dsp.h
+++ b/source/engine/dsp.h
@@ -130,4 +130,11 @@ void osc_fillbuf(struct osc *osc, short *buf, int n);
 
 void am_mod(struct dsp_ammod *mod, short *c, int n);
 
+struct dsp_reverb {
+    unsigned int time; /* Time in miliseconds for the sound to decay out */
+};
+
+struct dsp_filter make_reverb();
+void dsp_reverb_fillbuf(struct dsp_reverb *r, short *out, int n);
+
 #endif
\ No newline at end of file
diff --git a/source/engine/sound.c b/source/engine/sound.c
index b917453..6a9ff80 100755
--- a/source/engine/sound.c
+++ b/source/engine/sound.c
@@ -143,9 +143,9 @@ void sound_init()
 
 
 
-    sin20.f = square_phasor;
+    sin20.f = sin_phasor;
     sin20.p.sr = SAMPLERATE;
-    sin20.p.freq = 4;
+    sin20.p.freq = 250;
 
     s600wav = gen_sine(0.6f, 600, SAMPLERATE, CHANNELS);
 
@@ -178,9 +178,9 @@ void sound_init()
     struct dsp_filter ad = make_adsr(50, 200, 500, 100);
 
     dspammod.ina = s600;
-    dspammod.inb = ad;
+    dspammod.inb = s20;
 
-    first_free_bus(am_filter);
+   // first_free_bus(am_filter);
 
     struct dsp_filter wn;
     wn.filter = gen_pinknoise;
@@ -227,7 +227,7 @@ void sound_init()
 
 
 
-    play_song("", "");
+    //play_song("", "");
 }
 
 void audio_open(const char *device)