diff --git a/EngineMkI.cpp b/EngineMkI.cpp
index a4a1709..2a88c7f 100644
--- a/EngineMkI.cpp
+++ b/EngineMkI.cpp
@@ -37,7 +37,8 @@
 #ifdef _WIN32
 #if _MSC_VER < 1800
     FRAC_NUM log2(FRAC_NUM n)  {  
-        return log(n) / log(2.0);  
+        //return log(n) / log(2.0);  
+        return logf(n) / logf(2.0);  
     }
     FRAC_NUM round(FRAC_NUM n) {
         return n < 0.0 ? ceil(n - 0.5) : floor(n + 0.5);
@@ -81,7 +82,8 @@ EngineMkI::EngineMkI() {
     float bitReso = SINLOG_TABLESIZE;
     
     for(int i=0;i<SINLOG_TABLESIZE;i++) {
-        float x1 = sin(((0.5+i)/bitReso) * M_PI/2.0);
+        //float x1 = sin(((0.5+i)/bitReso) * M_PI/2.0);
+        float x1 = sinf(((0.5+i)/bitReso) * M_PI/2.0);
         sinLogTable[i] = round(-1024 * log2(x1));
     }
     
diff --git a/dx7note.cpp b/dx7note.cpp
index cd8bd4f..fa04a24 100644
--- a/dx7note.cpp
+++ b/dx7note.cpp
@@ -26,7 +26,8 @@
 const int FEEDBACK_BITDEPTH = 8;
 
 int32_t midinote_to_logfreq(int midinote) {
-  const int32_t base = 50857777;  // (1 << 24) * (log(440) / log(2) - 69/12)
+  //const int32_t base = 50857777;  // (1 << 24) * (log(440) / log(2) - 69/12)
+  const int32_t base = 50857777;  // (1 << 24) * (logf(440) / logf(2) - 69/12)
   const int32_t step = (1 << 24) / 12;
   return base + step * midinote;
 }
@@ -51,7 +52,8 @@ int32_t osc_freq(int midinote, int mode, int coarse, int fine, int detune) {
     logfreq += coarsemul[coarse & 31];
     if (fine) {
       // (1 << 24) / log(2)
-      logfreq += (int32_t)floor(24204406.323123 * log(1 + 0.01 * fine) + 0.5);
+      //logfreq += (int32_t)floor(24204406.323123 * log(1 + 0.01 * fine) + 0.5);
+      logfreq += (int32_t)floor(24204406.323123 * logf(1 + 0.01 * fine) + 0.5);
     }
 
     // // This was measured at 7.213Hz per count at 9600Hz, but the exact
diff --git a/sin.cpp b/sin.cpp
index d137a72..955c3bb 100644
--- a/sin.cpp
+++ b/sin.cpp
@@ -30,8 +30,10 @@ int32_t sintab[SIN_N_SAMPLES + 1];
 
 void Sin::init() {
   FRAC_NUM dphase = 2 * M_PI / SIN_N_SAMPLES;
-  int32_t c = (int32_t)floor(cos(dphase) * (1 << 30) + 0.5);
-  int32_t s = (int32_t)floor(sin(dphase) * (1 << 30) + 0.5);
+  //int32_t c = (int32_t)floor(cos(dphase) * (1 << 30) + 0.5);
+  int32_t c = (int32_t)floor(cosf(dphase) * (1 << 30) + 0.5);
+  //int32_t s = (int32_t)floor(sin(dphase) * (1 << 30) + 0.5);
+  int32_t s = (int32_t)floor(sinf(dphase) * (1 << 30) + 0.5);
   int32_t u = 1 << 30;
   int32_t v = 0;
   for (int i = 0; i < SIN_N_SAMPLES / 2; i++) {