Various changes

main.cpp

@@ -2,9 +2,9 @@
 #include <cmath>
 #include <iostream>
 
-#include "portaudio.h"
-#include "portmidi.h"
-#include "porttime.h"
+#include <portaudio.h>
+#include <portmidi.h>
+#include <porttime.h>
 
 #include "oscillator.h"
 #include "svf.h"

svf.h

@@ -58,6 +58,7 @@ public:
     }
 };
 
+// same filter but two of them chained for 24 dB/oct
 class SVFx2 {
 public:
     enum Mode { MODE_HP, MODE_BP, MODE_LP, MODE_BR, MODE_AP };