Convert .vox to .wav

mdlconvertvox2wav.Convert(SourceFileName, destinationFileName)
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Create a module
Module mdlconvertvox2wav
Dim WaveHeader() As Int32 = New Int32() {&H46464952, &HFFFFFFDB, &H45564157, &H20746D66, 16, &H10001, 6000, 12000, &H100002, &H61746164, -1}
Dim IndexShift() As Int16 = New Int16() {-1, -1, -1, -1, 2, 4, 6, 8}
Dim StepSize() As Int16 = New Int16() {16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209, 230, 253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899, 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794}
Dim Nibble2Bit(,) As Int16 = New Int16(,) {{0, 0, 0, 0}, {0, 0, 0, 1}, {0, 0, 1, 0}, {0, 0, 1, 1}, {0, 1, 0, 0}, {0, 1, 0, 1}, {0, 1, 1, 0}, {0, 1, 1, 1}, {1, 0, 0, 0}, {1, 0, 0, 1}, {1, 0, 1, 0}, {1, 0, 1, 1}, {1, 1, 0, 0}, {1, 1, 0, 1}, {1, 1, 1, 0}, {1, 1, 1, 1}}
Dim SignTable() As Int16 = New Int16() {1, -1}
Dim StepSizeIndex As Int16 = 0
Dim Signal As Int16 = -2
Dim AvgBuffer() As Int16 = New Int16() {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
Dim AvgIndex As Int16 = 0
Dim Total As Int32 = 0
Dim Length As Int32
Dim Offset As Int32
Dim nibble As Int16
Dim ReadBuffer(4096) As Byte
Dim WriteBuffer(8192) As Int16

Public Sub Convert(ByVal srcVOXFile As String, ByVal destWAVFile As String)
Dim strm As New IO.FileStream(srcVOXFile, IO.FileMode.Open, IO.FileAccess.Read)
FileOpen(2, destWAVFile, OpenMode.Binary, OpenAccess.Write, OpenShare.LockWrite)
FilePut(2, WaveHeader)
Length = 4096
While Length = 4096
Length = strm.Read(ReadBuffer, 0, 4096)
For Offset = 0 To Length - 1
nibble = 0
Signal += Decode(ReadBuffer(Offset) \ 16)
If (Signal > 2047 Or Signal < -2047) Then Truncate()
WriteBuffer(2 * Offset) = Signal
nibble = 1
Signal += Decode(ReadBuffer(Offset) Mod 16)
If (Signal > 2047 Or Signal < -2047) Then Truncate()
WriteBuffer(2 * Offset + 1) = Signal
Next
FilePut(2, WriteBuffer)
Total += Length
End While
strm.Close() : strm = Nothing
Total = 4 * Total
Length = Total + 36
FilePut(2, Length, 4 + 1)
FilePut(2, Total, 40 + 1)
FileClose(2)
End Sub

Public Function Decode(ByVal i As Byte) As Int16
Dim diff As Int16
Dim value As Int32
value = 2 * Total + 2 * Offset + nibble
diff = SignTable(Nibble2Bit(i, 0)) * (StepSize(StepSizeIndex) * Nibble2Bit(i, 1) + (StepSize(StepSizeIndex) / 2) * Nibble2Bit(i, 2) + (StepSize(StepSizeIndex) / 4) * Nibble2Bit(i, 3) + (StepSize(StepSizeIndex) / 8))
StepSizeIndex = StepSizeIndex + IndexShift(i Mod 8)
If StepSizeIndex < 0 Then StepSizeIndex = 0
If StepSizeIndex > 48 Then
StepSizeIndex = 48
End If
Return diff
End Function

Public Sub Truncate()
Dim value As Int32
value = 2 * Total + 2 * Offset + nibble
If Signal > 2047 Then Signal = 2047
If Signal < -2047 Then Signal = -2047
End Sub

End Module
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