<s>
Cross-platform	B-Library
Audio	I-Library
Creation	I-Library
Tool	I-Library
(	O
XACT	O
)	O
is	O
an	O
audio	O
programming	B-Library
library	I-Library
and	O
engine	O
released	O
by	O
Microsoft	O
as	O
part	O
of	O
the	O
DirectX	B-Application
SDK	B-Application
.	O
</s>
<s>
It	O
is	O
a	O
high-level	O
audio	O
library	O
for	O
authoring/playing	O
audio	O
that	O
is	O
written	O
to	O
use	O
Xaudio	O
on	O
the	O
Xbox	B-Application
,	O
DirectSound	B-Device
on	O
Windows	B-Application
XP	I-Application
,	O
and	O
the	O
new	O
audio	O
stack	O
on	O
Windows	B-Application
Vista	I-Application
and	O
Windows	B-Device
7	I-Device
.	O
</s>
<s>
Xaudio	O
is	O
an	O
Xbox-only	O
API	O
designed	O
for	O
optimal	O
digital	O
signal	O
processing	O
.	O
</s>
<s>
XACT	O
also	O
includes	O
X3DAudio	O
,	O
a	O
spatialization	O
helper	O
library	O
available	O
on	O
both	O
platforms	O
,	O
Windows	O
and	O
the	O
Xbox	B-Application
.	O
</s>
<s>
XACT	O
was	O
originally	O
developed	O
for	O
Xbox	B-Application
development	O
,	O
and	O
was	O
later	O
modified	O
to	O
work	O
for	O
Microsoft	B-Application
Windows	I-Application
development	O
as	O
well	O
.	O
</s>
<s>
The	O
original	O
release	O
of	O
XACT	O
was	O
in	O
2002	O
and	O
shipped	O
as	O
part	O
of	O
the	O
Xbox	B-Application
SDK	B-Application
only	O
and	O
was	O
originally	O
called	O
the	O
"	O
Xbox	B-Application
Audio	O
Creation	O
Tool	O
"	O
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
allow	O
sound	O
designers	O
and	O
composers	O
for	O
the	B-Application
original	I-Application
Xbox	I-Application
console	O
to	O
have	O
access	O
and	O
control	O
of	O
the	O
powerful	O
MCPx	O
audio	O
chip	O
in	O
the	O
console	O
,	O
which	O
previously	O
could	O
only	O
be	O
accessed	O
through	O
program	O
code	O
,	O
via	O
Xbox	B-Application
extensions	O
to	O
DirectSound	B-Device
.	O
</s>
<s>
Later	O
,	O
under	O
the	O
XNA	B-Device
initiative	O
,	O
it	O
was	O
re-written	O
to	O
work	O
on	O
both	O
Windows	O
and	O
Xbox	B-Application
and	O
renamed	O
the	O
"	O
Cross-platform	B-Library
Audio	I-Library
Creation	I-Library
Tool	I-Library
"	O
and	O
included	O
as	O
part	O
of	O
the	O
DirectX	B-Application
SDK	B-Application
.	O
</s>
<s>
Support	O
for	O
XACT	O
has	O
been	O
carried	O
over	O
from	O
DirectX	B-Application
to	O
XNA	B-Device
.	O
</s>
<s>
The	O
XACT	O
Audio	O
Authoring	O
Tool	O
is	O
also	O
available	O
in	O
XNA	B-Device
Game	I-Device
Studio	I-Device
.	O
</s>
<s>
With	O
the	O
release	O
of	O
Windows	O
SDK	B-Application
for	O
Windows	O
8	O
Developer	O
Preview	O
,	O
XACT	O
is	O
no	O
longer	O
supported	O
on	O
Windows	O
.	O
</s>
