[1.29.07] Reduce clicks at very low pitches due to numerical overflow in wave generation.

Treat echo-delay = 0 as "no echo", even if ech-amplitude is set.
lang=ru, fix crash for "words" which has produce no phonemes (wg. ":").


git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@88 d46cf337-b52f-0410-862d-fd96e6ae7743

src/voices.cpp

@@ -396,9 +396,9 @@ static void VoiceFormant(char *p)
 	// Set parameters for a formant
 	int ix;
 	int formant;
-	int freq = -1;
-	int height = -1;
-	int width = -1;
+	int freq = 100;
+	int height = 100;
+	int width = 100;
 
 	ix = sscanf(p,"%d %d %d %d",&formant,&freq,&height,&width);
 	if(ix < 2)
@@ -713,7 +713,7 @@ voice_t *LoadVoice(const char *vname, int control)
 			{
 				while(isspace(*p)) p++;
 				n = -1;
-				if((n = atoi(p)) > 0)
+				if(((n = atoi(p)) > 0) && (n < 32))
 				{
 					p++;
 					conditional_rules |= (1 << n);