Those wern't harmonics, the selected frequency (And loudest bit) was the

third harmonic (First three were played with increasing amplitude)
Add a "real" harmonic set for the two _HARM shapes and rename the old
SINE_SAW_HARM to SINE_SAW_CHORD ('cause it sounded cool)
New default is SINE_SAW_HARM and sounds niceish.

src/xpdev/xpbeep.c

@@ -34,6 +34,7 @@ enum {
 	,WAVE_SHAPE_SQUARE
 	,WAVE_SHAPE_SINE_SAW
 	,WAVE_SHAPE_SINE_HARM
+	,WAVE_SHAPE_SINE_SAW_CHORD
 	,WAVE_SHAPE_SINE_SAW_HARM
 };
 
@@ -66,8 +67,8 @@ void makewave(double freq, unsigned char *wave, int samples)
 				break;
 			case WAVE_SHAPE_SINE_HARM:
 				wave[i]=(sin (pos))*64+128;
-				wave[i]=(sin ((inc/2)*(double)i))*24+128;
-				wave[i]=(sin ((inc/3)*(double)i))*16+128;
+				wave[i]=(sin ((inc*2)*(double)i))*24+128;
+				wave[i]=(sin ((inc*3)*(double)i))*16+128;
 				break;
 			case WAVE_SHAPE_SAWTOOTH:
 				wave[i]=(WAVE_TPI-pos)*40.5;
@@ -78,11 +79,16 @@ void makewave(double freq, unsigned char *wave, int samples)
 			case WAVE_SHAPE_SINE_SAW:
 				wave[i]=(((sin (pos))*127+128)+((WAVE_TPI-pos)*40.5))/2;
 				break;
-			case WAVE_SHAPE_SINE_SAW_HARM:
+			case WAVE_SHAPE_SINE_SAW_CHORD:
 				wave[i]=(((sin (pos))*64+128)+((WAVE_TPI-pos)*6.2))/2;
 				wave[i]+=(sin ((inc/2)*(double)i))*24+128;
 				wave[i]+=(sin ((inc/3)*(double)i))*16+128;
 				break;
+			case WAVE_SHAPE_SINE_SAW_HARM:
+				wave[i]=(((sin (pos))*64+128)+((WAVE_TPI-pos)*6.2))/2;
+				wave[i]+=(sin ((inc*2)*(double)i))*24+128;
+				wave[i]+=(sin ((inc*3)*(double)i))*16+128;
+				break;
 		}
 	}
 	

src/xpdev/xpbeep.h

@@ -4,7 +4,7 @@
 #include "gen_defs.h"
 
 #if defined(_WIN32)
-	#if 0
+	#if 1
 	#define BEEP(freq,dur)	xpbeep((double)(freq),(DWORD)(dur))
 	#else
 	#define BEEP(freq,dur)	Beep((DWORD)(freq),(DWORD)(dur))