diff --git a/hairtunes.c b/hairtunes.c
index 181dd031..8b815111 100644
--- a/hairtunes.c
+++ b/hairtunes.c
@@ -548,6 +548,12 @@ static int init_rtp(void) {
     return port;
 }
 
+static short lcg_rand(void) {
+	static unsigned long lcg_prev = 12345;
+	lcg_prev = lcg_prev * 69069 + 3;
+	return lcg_prev & 0xffff;
+}
+
 static inline short dithered_vol(short sample) {
     static short rand_a, rand_b;
     long out;
@@ -555,7 +561,7 @@ static inline short dithered_vol(short sample) {
     out = (long)sample * fix_volume;
     if (fix_volume < 0x10000) {
         rand_b = rand_a;
-        rand_a = rand() & 0xffff;
+        rand_a = lcg_rand();
         out += rand_a;
         out -= rand_b;
     }
@@ -575,7 +581,7 @@ static void biquad_init(biquad_t *bq, double a[], double b[]) {
 }
 
 static void biquad_lpf(biquad_t *bq, double freq, double Q) {
-    double w0 = 2*M_PI*freq/((float)sampling_rate/(float)frame_size);
+    double w0 = 2.0 * M_PI * freq * frame_size / (double)sampling_rate;
     double alpha = sin(w0)/(2.0*Q);
 
     double a_0 = 1.0 + alpha;
@@ -706,7 +712,7 @@ static int stuff_buffer(double playback_rate, short *inptr, short *outptr) {
 
     p_stuff = 1.0 - pow(1.0 - fabs(playback_rate-1.0), frame_size);
 
-    if ((float)rand()/((float)RAND_MAX) < p_stuff) {
+    if (rand() < p_stuff * RAND_MAX) {
         stuff = playback_rate > 1.0 ? -1 : 1;
         stuffsamp = rand() % (frame_size - 1);
     }