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Prevent denormalized numbers in RC filter routine

--- a/src/pt2_audio.c

+++ b/src/pt2_audio.c

@@ -245,7 +245,11 @@

 // aciddose: input 0 is resistor side of capacitor (low-pass), input 1 is reference side (high-pass)

 static inline double getLowpassOutput(rcFilter_t *f, const double input_0, const double input_1, const double buffer)

 {

-	return buffer * f->g + input_0 * f->cg + input_1 * (1.0 - f->cg);

+	double dOutput = DENORMAL_OFFSET;

+

+	dOutput += buffer * f->g + input_0 * f->cg + input_1 * (1.0 - f->cg);

+

+	return dOutput;

 }

 void RCLowPassFilter(rcFilter_t *f, const double *in, double *out)

--- a/src/pt2_audio.h

+++ b/src/pt2_audio.h

@@ -4,8 +4,8 @@

 #include <stdbool.h>

 #include "pt2_header.h" // AMIGA_VOICES

-// adding this forces the FPU to enter slow mode

-#define DENORMAL_OFFSET 1e-10

+// adding this prevents denormalized numbers, which is slow

+#define DENORMAL_OFFSET 1e-15

 typedef struct rcFilter_t

 {

--- a/src/pt2_keyboard.c

+++ b/src/pt2_keyboard.c

@@ -30,7 +30,6 @@

 #include "pt2_config.h"

 #include "pt2_sampling.h"

-

 #if defined _WIN32 && !defined _DEBUG

 extern bool windowsKeyIsDown;

 extern HHOOK g_hKeyboardHook;