Added FixMath to Oscil.h

Oscil.h

@@ -21,6 +21,7 @@
 #endif
 #include "MozziGuts.h"
 #include "mozzi_fixmath.h"
+#include "FixMath.h"
 #include "mozzi_pgmspace.h"
 
 #ifdef OSCIL_DITHER_PHASE
@@ -154,6 +155,19 @@ class Oscil
 	}
 
 
+	/** Returns the next sample given a phase modulation value.
+	@param phmod_proportion a phase modulation value given as a proportion of the wave. The
+	phmod_proportion parameter is a SFixMath<15,16> fixed-point number where the fractional part represents almost -1 to almost 1, modulating the phase by one whole table length in
+	each direction.
+	@return a sample from the table.
+	*/
+	inline
+	int8_t phMod(SFixMath<15,16> phmod_proportion)
+	{
+	  return phMod(phmod_proportion.asRaw());
+	}
+
+
 	/** Set the oscillator frequency with an unsigned int. This is faster than using a
 	float, so it's useful when processor time is tight, but it can be tricky with
 	low and high frequencies, depending on the size of the wavetable being used. If
@@ -207,6 +221,19 @@ class Oscil
 		}
 	}
 
+  	/** Set the frequency using UFixMath<24,8> fixed-point number format.
+	This might be faster than the float version for setting low frequencies such as
+	1.5 Hz, or other values which may not work well with your table size. A UFixMath<24,8>
+	representation of 1.5 is 384 (ie. 1.5 * 256). Can't be used with UPDATE_RATE
+	less than 64 Hz.
+	@param frequency in UFixMath<24,8> fixed-point number format.
+	*/
+        inline
+	void setFreq(UFixMath<24,8> frequency)
+        {
+	  setFreq_Q24n8(frequency.asRaw());
+        }
+
 
 	/** Set the frequency using Q16n16 fixed-point number format. This is useful in
 	combination with Q16n16_mtof(), a fast alternative to mtof(), using Q16n16
@@ -230,6 +257,22 @@ class Oscil
 			phase_increment_fractional = ((unsigned long)frequency) / (UPDATE_RATE/NUM_TABLE_CELLS);
 		}
 	}
+
+
+	/** Set the frequency using UFixMath<16,16> fixed-point number format. This is useful in
+	combination with Q16n16_mtof(), a fast alternative to mtof(), using UFixMath<16,16>
+	fixed-point format instead of fractional numbers.
+	@note This should work OK with tables 2048 cells or smaller and
+	frequencies up to 4096 Hz.  Can't be used with UPDATE_RATE less than 64 Hz.
+	@note This didn't run faster than float last time it was tested, after 2014 code changes.  Need to see if 2014 changes improved or worsened performance.
+	@param frequency in UFixMath<16,16> fixed-point number format.
+	*/
+        inline
+	void setFreq(UFixMath<16,16> frequency)
+        {
+	  setFreq_Q16n16(frequency.asRaw());
+        }
+
 /*
 	inline
 	void setFreqMidi(int8_t note_num) {