diff --git a/ANSI.c b/ANSI.c
index d5afdb6..3bcd73d 100644
--- a/ANSI.c
+++ b/ANSI.c
@@ -152,7 +152,7 @@
     remove wcstok, avoiding potential interference with the host;
     similarly, use a private heap instead of malloc.
 
-  v1.80, 26 October to 17 November, 2017:
+  v1.80, 26 October to 19 November, 2017:
     fix unloading;
     revert back to (re)storing buffer cursor position;
     increase cache to five handles;
@@ -160,7 +160,8 @@
     fix cursor report with duplicated digits (e.g. "11" was just "1");
     preserve escape that isn't part of a sequence;
     fix escape followed by CRM in control mode;
-    use the system default sound for the bell.
+    use the system default sound for the bell;
+    add DECPS Play Sound.
 */
 
 #include "ansicon.h"
@@ -1150,6 +1151,41 @@ void InterpretEscSeq( void )
       case 'l': // ESC[#l Reset Mode
       return;			// ESC[3l is handled during parsing
 
+      case '~':
+	if (suffix2 == ',') // ESC[#;#;#...,~ Play Sound
+	{
+	  // Frequencies of notes obtained from:
+	  //	https://pages.mtu.edu/~suits/notefreqs.html
+	  //	http://www.liutaiomottola.com/formulae/freqtab.htm
+	  // This is different to what the VT520 manual has, but since that
+	  // only specifies four frequencies, so be it.  I've also rounded to
+	  // even numbers, as the Beep function seems to stutter on odd.
+	  static const DWORD snd_freq[] = { 0,
+//	C    C#/Db  D	 D#/Eb	E     F    F#/Gb  G    G#/Ab  A    A#/Bb  B
+/* 5 */  524,  554,  588,  622,  660,  698,  740,  784,  830,  880,  932,  988,
+/* 6 */ 1046, 1108, 1174, 1244, 1318, 1396, 1480, 1568, 1662, 1760, 1864, 1976,
+/* 7 */ 2094
+	  };
+	  DWORD dur;
+	  if (es_argc < 2) return;
+	  dur = es_argv[1];
+	  if (dur <= 48)		// use 1/32 second
+	    dur = 1000 * dur / 32;
+	  else if (dur > 8000)		// max out at 8 seconds
+	    dur = 8000;
+	  if (es_argc == 2)		// no notes
+	    Sleep( dur );
+	  else for (i = 2; i < es_argc; ++i)
+	  {
+	    if (es_argv[0] == 0)	// zero volume
+	      Sleep( dur );
+	    else
+	      Beep( (es_argv[i] < lenof(snd_freq)) ? snd_freq[es_argv[i]]
+						   : es_argv[i], dur );
+	  }
+	}
+      return;
+
       default:
       return;
     }
@@ -1285,7 +1321,7 @@ ParseAndPrintString( HANDLE hDev,
       {
 	suffix2 = c;
       }
-      else if (suffix2 != 0)
+      else if (suffix2 != 0 && suffix2 != ',')
       {
 	state = 1;
       }
@@ -1318,7 +1354,7 @@ ParseAndPrintString( HANDLE hDev,
       {
 	suffix2 = c;
       }
-      else if (suffix2 != 0)
+      else if (suffix2 != 0 && suffix2 != ',')
       {
 	state = 1;
       }
@@ -2113,7 +2149,7 @@ WINAPI MyWriteConsoleA( HANDLE hCon, LPCVOID lpBuffer,
   if (nNumberOfCharsToWrite != 0 && IsConsoleHandle( hCon ))
   {
     DEBUGSTR( 4, "%s: %u %\"<s",
-		 write_func == NULL ? "WriteConsoleA" : write_func,
+		 (write_func == NULL) ? "WriteConsoleA" : write_func,
 		 nNumberOfCharsToWrite, lpBuffer );
     write_func = NULL;
     aBuf = lpBuffer;
diff --git a/ansicon.c b/ansicon.c
index aa5fe90..b4181bd 100644
--- a/ansicon.c
+++ b/ansicon.c
@@ -90,7 +90,7 @@
     write newline with _putws, not putwchar (fixes redirecting to CON).
 */
 
-#define PDATE L"17 November, 2017"
+#define PDATE L"19 November, 2017"
 
 #include "ansicon.h"
 #include "version.h"
diff --git a/readme.txt b/readme.txt
index 2f62ddd..a1a82f8 100644
--- a/readme.txt
+++ b/readme.txt
@@ -169,7 +169,8 @@ Sequences Recognised
 	\e[#A		CUU	Cursor Up
 	\e[#P		DCH	Delete Character
 	\e[?7h		DECAWM	DEC Autowrap Mode (autowrap)
-	\e[?7l		DECAWM	DEC Autowrap Mode (no autowrap) 
+	\e[?7l		DECAWM	DEC Autowrap Mode (no autowrap)
+	\e[#;#;#...,~	DECPS	DEC Play Sound
 	\e[?25h 	DECTCEM DEC Text Cursor Enable Mode (show cursor)
 	\e[?25l 	DECTCEM DEC Text Cursor Enable Mode (hide cursor)
 	\e[#M		DL	Delete Line
@@ -304,7 +305,8 @@ Version History
     - fix escape followed by CRM in control mode;
     * go back to saving the buffer cursor position;
     * preserve escape that isn't part of a sequence;
-    + use the system default sound for the bell.
+    + use the system default sound for the bell;
+    + added Play Sound DECPS.
 
     1.72 - 24 December, 2015:
     - handle STD_OUTPUT_HANDLE & STD_ERROR_HANDLE in WriteFile;
@@ -533,4 +535,4 @@ Distribution
 
 
 =============================
-Jason Hood, 17 November, 2017.
+Jason Hood, 19 November, 2017.
diff --git a/sequences.txt b/sequences.txt
index 0b1e252..04e5a7e 100644
--- a/sequences.txt
+++ b/sequences.txt
@@ -1,6 +1,6 @@
 
 				    ANSICON
-				  Version 1.70
+				  Version 1.80
 
 This is a complete list of the ANSI escape sequences recognised by ANSICON,
 roughly ordered by function.  The initial escape character is assumed.
@@ -128,3 +128,20 @@ roughly ordered by function.  The initial escape character is assumed.
 ]2;TitleST
 	sets the console title to "Title"; ST (string terminator) is either
 	 character 7 (BEL) or escape and backslash
+
+[#;#;#...,~
+	play sound (beep):
+	  the first value is volume: 0 is silence, anything else is ignored
+	  the second value is duration: up to and including 48 is in 1/32 of a
+	   second; anything else is milliseconds (maximum of 8000)
+	  the remaining values (if any; 14 allowed) are notes or frequencies:
+	    Value  Note     Freq   Value  Note	   Freq   Value  Note	  Freq
+		0  silence     0       9  G#5/Ab5   830      18  F6	  1396
+		1  C5	     524      10  A5	    880      19  F#6/Gb6  1480
+		2  C#5/Db5   554      11  A#5/Bb5   932      20  G6	  1568
+		3  D5	     588      12  B5	    988      21  G#6/Ab6  1662
+		4  D#5/Eb5   622      13  C6	   1046      22  A6	  1760
+		5  E5	     660      14  C#6/Db6  1108      23  A#6/Bb6  1864
+		6  F5	     698      15  D6	   1174      24  B6	  1976
+		7  F#5/Gb5   740      16  D#6/Eb6  1244      25  C7	  2094
+		8  G5	     784      17  E6	   1318