@geri and @silly cow here are the comparison videos:

My attempt

How it should sound

How long is the half sample? It might be that your IRQ is not configured correctly. Can you confirm that you are getting an interrupt request once youe buffer is empty?

@undefined Nah these are the whole samples. These are the ones provided with the library's demo code. And I didnt think the library does interrupt requests… The library only does real mode requests, from what I have seen.

Edit: OOOOH I didnt realize what you were talking about there The demo does an interrupt (the command) request, but I took that out because i wanted the sound to play in game without an interrupt.

And if you want to see it for some reason, here is the entirety of the demo application. It looks long, but there are several defines for the different types of Watcom modes (I am using DOS4GW).

#include <process.h>
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <malloc.h>
#include <io.h>
#include <conio.h>
#include <ctype.h>

#include "ail32.h"
#include "dll.h"

const char VERSION[] = "1.02";

/*****************************************************************/
void main(int argc, char *argv[])
{
   HDRIVER hdriver;
   char *drvr;
   char *dll;
   drvr_desc *desc;
   union REGS inregs,outregs;
   unsigned VOCseg;
   char *VOCbuf;

#ifdef __HIGHC__
   unsigned char *buffer;
   FARPTR VOCfar;
   ULONG i;
#endif

   setbuf(stdout,NULL);

   printf("\nVP32 version %s                   Copyright (C) 1991, 1992 Miles Design, Inc.\n",VERSION);
   printf("-------------------------------------------------------------------------------\n\n");

   if (argc != 3)
      {
      printf("This program plays a Creative Voice File (.VOC) through any Audio Interface\n");
      printf("Library digital sound driver.\n\n");
      printf("Usage: VP32 filename.voc driver.dll\n");
      exit(1);
      }

   //
   // Allocate a buffer for the .VOC file in real-mode (lower 1MB) memory
   //

#ifdef DPMI          // Rational Systems DOS/4GW

   inregs.x.eax = 0x100;
   inregs.x.ebx = ((FILE_size(argv[1])+16) / 16);

   int386(0x31,&inregs,&outregs);

   if (outregs.x.cflag)
      {
      printf("Insufficient memory to load %s.\n",argv[1]);
      AIL_shutdown(NULL);
      exit(1);
      }

   VOCseg = outregs.x.eax << 16;
   VOCbuf = (char *) (outregs.x.eax * 16);

#else
#ifdef INT21         // Flashtek X32 / Phar Lap 386

#ifdef __ZTC__                      // Zortech C++
   inregs.e.eax = 0x4800;
   inregs.e.ebx = ((FILE_size(argv[1])+16) / 16);

   int86(0x21,&inregs,&outregs);

   if (outregs.e.cflag)
      {
      printf("Insufficient memory to load %s.\n",argv[1]);
      AIL_shutdown(NULL);
      exit(1);
      }

   VOCseg = outregs.e.eax << 16;
   VOCbuf = (char *) outregs.e.ebx;

#else
#ifdef __HIGHC__                    // MetaWare C++
   inregs.w.eax = 0x25c0;
   inregs.w.ebx = ((FILE_size(argv[1])+16) / 16);

   int86(0x21,&inregs,&outregs);

   if (outregs.w.cflag)
      {
      printf("Insufficient memory to load %s.\n",argv[1]);
      AIL_shutdown(NULL);
      exit(1);
      }

   VOCseg = outregs.w.eax << 16;
   VOCbuf = (char *) ((outregs.w.eax & 0xffff) * 16);

#else                               // Watcom C++
   inregs.x.eax = 0x4800;
   inregs.x.ebx = ((FILE_size(argv[1])+16) / 16);

   int386(0x21,&inregs,&outregs);

   if (outregs.x.cflag)
      {
      printf("Insufficient memory to load %s.\n",argv[1]);
      AIL_shutdown(NULL);
      exit(1);
      }

   VOCseg = outregs.x.eax << 16;
   VOCbuf = (char *) outregs.x.ebx;
#endif
#endif
#endif
#endif

   //
   // Read the entire .VOC file into memory
   //
   // Under MetaWare/Phar Lap, we will buffer it down into lower (far) memory
   // since FILE_read() requires a near pointer
   //

#ifdef __HIGHC__

   buffer = FILE_read(argv[1],NULL);

   if (buffer == NULL)
      {
      printf("Couldn't load %s.\n",argv[1]);
      AIL_shutdown(NULL);
      exit(1);
      }

   VOCfar.part.seg = 0x34;
   VOCfar.part.off = (ULONG) VOCbuf;
   
   for (i=FILE_size(argv[1]);i;i--)
      {
      ((_Far UBYTE *) VOCfar.ptr)[i-1] = buffer[i-1];
      }

   free(buffer);

#else

   VOCbuf = FILE_read(argv[1],VOCbuf);

   if (VOCbuf == NULL)
      {
      printf("Couldn't load %s.\n",argv[1]);
      AIL_shutdown(NULL);
      exit(1);
      }

#endif

   //
   // Load driver file
   //

   dll = FILE_read(argv[2],NULL);
   if (dll==NULL)
      {
      printf("Could not load driver '%s'.\n",argv[2]);
      exit(1);
      }

   drvr=DLL_load(dll,DLLMEM_ALLOC | DLLSRC_MEM,NULL);
   if (drvr==NULL)     
      {
      printf("Invalid DLL image.\n");
      exit(1);
      }

   free(dll);

   //
   // Initialize API before calling any Library functions
   //

   AIL_startup();

   hdriver = AIL_register_driver(drvr);
   if (hdriver==-1)
      {
      printf("Driver %s not compatible with linked API version.\n",
         argv[2]);
      AIL_shutdown(NULL);
      exit(1);
      }

   //
   // Get driver type and factory default I/O parameters; exit if
   // driver is not capable of interpreting PCM sound data
   //

   desc = AIL_describe_driver(hdriver);

   if (desc->drvr_type != DSP_DRVR)
      {
      printf("%s is not a digital sound driver.\n",argv[2]);
      AIL_shutdown(NULL);
      exit(1);
      }

   if (!AIL_detect_device(hdriver,desc->default_IO,desc->default_IRQ,
      desc->default_DMA,desc->default_DRQ))
         {
         printf("Sound hardware not found.\n");
         AIL_shutdown(NULL);
         exit(1);
         }

   AIL_init_driver(hdriver,desc->default_IO,desc->default_IRQ,
      desc->default_DMA,desc->default_DRQ);

   //
   // Format .VOC file data and begin playback
   //

#ifdef __HIGHC__
   AIL_format_VOC_file(hdriver,VOCfar.ptr,-1);

   AIL_play_VOC_file(hdriver,VOCfar.ptr,VOCseg,-1);
#else
   AIL_format_VOC_file(hdriver,(void far *) VOCbuf,-1);

   AIL_play_VOC_file(hdriver,(void far *) VOCbuf,VOCseg,-1);
#endif

   AIL_start_digital_playback(hdriver);

#ifdef __HIGHC__

   printf("Press any key to stop ... \n");

   while (AIL_VOC_playback_status(hdriver) != DAC_DONE)
      {
      if (kbhit())
         {
         getch();
         break;
         }
      }

#else
   printf("Launching DOS shell.  Type 'EXIT' to stop playback and ");
   printf("exit VP32.");

   system("command");
#endif

   printf("VP32 stopped.\n");
   AIL_shutdown(NULL);
}