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diff --git a/portaudio/pablio/test_rw_echo.c b/portaudio/pablio/test_rw_echo.c
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+/*
+ * $Id$
+ * test_rw_echo.c
+ * Echo delayed input to output.
+ *
+ * Author: Phil Burk, http://www.softsynth.com/portaudio/
+ *
+ * This program uses PABLIO, the Portable Audio Blocking I/O Library.
+ * PABLIO is built on top of PortAudio, the Portable Audio Library.
+ *
+ * Note that if you need low latency, you should not use PABLIO.
+ * Use the PA_OpenStream callback technique which is lower level
+ * than PABLIO.
+ *
+ * For more information see: http://www.portaudio.com
+ * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * The text above constitutes the entire PortAudio license; however, 
+ * the PortAudio community also makes the following non-binding requests:
+ *
+ * Any person wishing to distribute modifications to the Software is
+ * requested to send the modifications to the original developer so that
+ * they can be incorporated into the canonical version. It is also 
+ * requested that these non-binding requests be included along with the 
+ * license above.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "pablio.h"
+#include <string.h>
+
+/*
+** Note that many of the older ISA sound cards on PCs do NOT support
+** full duplex audio (simultaneous record and playback).
+** And some only support full duplex at lower sample rates.
+*/
+#define SAMPLE_RATE         (22050)
+#define NUM_SECONDS            (20)
+#define SAMPLES_PER_FRAME       (2)
+
+/* Select whether we will use floats or shorts. */
+#if 1
+#define SAMPLE_TYPE  paFloat32
+typedef float SAMPLE;
+#else
+#define SAMPLE_TYPE  paInt16
+typedef short SAMPLE;
+#endif
+
+#define NUM_ECHO_FRAMES   (2*SAMPLE_RATE)
+SAMPLE   samples[NUM_ECHO_FRAMES][SAMPLES_PER_FRAME] = {0.0};
+
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+    int      i;
+    PaError  err;
+    PABLIO_Stream     *aInStream;
+    PABLIO_Stream     *aOutStream;
+    int      index;
+
+    printf("Full duplex sound test using PABLIO\n");
+    fflush(stdout);
+
+    /* Open simplified blocking I/O layer on top of PortAudio. */
+    /* Open input first so it can start to fill buffers. */
+    err = OpenAudioStream( &aInStream, SAMPLE_RATE, SAMPLE_TYPE,
+                           (PABLIO_READ | PABLIO_STEREO) );
+    if( err != paNoError ) goto error;
+    /* printf("opened input\n");  fflush(stdout); /**/
+
+    err = OpenAudioStream( &aOutStream, SAMPLE_RATE, SAMPLE_TYPE,
+                           (PABLIO_WRITE | PABLIO_STEREO) );
+    if( err != paNoError ) goto error;
+    /* printf("opened output\n");  fflush(stdout); /**/
+
+    /* Process samples in the foreground. */
+    index = 0;
+    for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i++ )
+    {
+        /* Write old frame of data to output. */
+        /* samples[index][1] = (i&256) * (1.0f/256.0f); /* sawtooth */
+        WriteAudioStream( aOutStream, &samples[index][0], 1 );
+
+        /* Read one frame of data into sample array for later output. */
+        ReadAudioStream( aInStream, &samples[index][0], 1 );
+        index += 1;
+        if( index >= NUM_ECHO_FRAMES ) index = 0;
+
+        if( (i & 0xFFFF) == 0 ) printf("i = %d\n", i ); fflush(stdout); /**/
+    }
+
+    CloseAudioStream( aOutStream );
+    CloseAudioStream( aInStream );
+
+    printf("R/W echo sound test complete.\n" );
+    fflush(stdout);
+    return 0;
+
+error:
+    fprintf( stderr, "An error occurred while using PortAudio\n" );
+    fprintf( stderr, "Error number: %d\n", err );
+    fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
+    return -1;
+}