<s>
Universal	B-Device
Audio	I-Device
Architecture	I-Device
(	O
UAA	O
)	O
is	O
an	O
initiative	O
unveiled	O
in	O
2002	O
by	O
Microsoft	O
to	O
standardize	O
the	O
hardware	O
and	O
class	B-Application
driver	I-Application
architecture	O
for	O
audio	O
devices	O
in	O
modern	O
Microsoft	B-Application
Windows	I-Application
operating	I-Application
systems	I-Application
.	O
</s>
<s>
Three	O
classes	O
of	O
audio	O
devices	O
are	O
supported	O
by	O
default	O
:	O
USB	B-Protocol
,	O
IEEE	B-Protocol
1394	I-Protocol
(	O
FireWire	B-Protocol
)	O
,	O
and	O
Intel	O
High	O
Definition	O
Audio	O
,	O
which	O
supports	O
PCI	B-Protocol
and	O
PCI	B-Protocol
Express	O
.	O
</s>
<s>
Starting	O
with	O
Windows	B-Application
Vista	I-Application
,	O
Microsoft	O
requires	O
all	O
computer	O
and	O
audio	O
device	O
manufacturers	O
to	O
support	O
Universal	B-Device
Audio	I-Device
Architecture	I-Device
in	O
order	O
to	O
pass	O
Windows	O
Logo	O
certification	O
.	O
</s>
<s>
The	O
goal	O
of	O
the	O
Universal	B-Device
Audio	I-Device
Architecture	I-Device
is	O
to	O
solve	O
a	O
very	O
common	O
problem	O
in	O
older	O
Microsoft	B-Application
Windows	I-Application
products	O
,	O
that	O
of	O
inconsistent	O
support	O
for	O
audio	O
.	O
</s>
<s>
Due	O
to	O
the	O
lack	O
of	O
a	O
common	O
system	O
by	O
which	O
audio	O
devices	O
could	O
describe	O
their	O
capabilities	O
to	O
the	O
operating	B-General_Concept
system	I-General_Concept
,	O
not	O
to	O
mention	O
a	O
lack	O
of	O
ability	O
to	O
control	O
those	O
capabilities	O
,	O
audio	O
device	O
manufacturers	O
(	O
such	O
as	O
Creative	O
Labs	O
,	O
Realtek	O
,	O
Turtle	O
Beach	O
and	O
others	O
)	O
have	O
had	O
to	O
provide	O
a	O
series	O
of	O
control	O
panels	O
and	O
custom	O
interfaces	O
to	O
let	O
a	O
user	O
control	O
the	O
device	O
.	O
</s>
<s>
These	O
concerns	O
prompted	O
Microsoft	O
to	O
disable	O
the	O
audio	O
stack	O
entirely	O
by	O
default	O
in	O
Windows	B-Application
Server	I-Application
2003	I-Application
.	O
</s>
<s>
Another	O
goal	O
of	O
UAA	O
is	O
to	O
provide	O
better	O
support	O
for	O
multi-channel	O
audio	O
in	O
Windows	O
so	O
that	O
,	O
for	O
example	O
,	O
multi-channel	O
WMA	B-Application
Pro	I-Application
audio	O
streams	O
can	O
be	O
played	O
without	O
special	O
driver	O
support	O
.	O
</s>
<s>
UAA	O
is	O
intended	O
to	O
be	O
a	O
complete	O
replacement	O
for	O
developing	O
WDM	B-Application
Audio	O
Drivers	O
;	O
however	O
,	O
in	O
some	O
cases	O
it	O
may	O
be	O
necessary	O
for	O
an	O
otherwise	O
UAA-compliant	O
audio	O
device	O
to	O
expose	O
capabilities	O
that	O
cannot	O
be	O
done	O
through	O
UAA	O
.	O
</s>
<s>
In	O
2004	O
,	O
Microsoft	O
provided	O
the	O
first	O
version	O
of	O
UAA	O
as	O
an	O
update	O
to	O
Windows	B-Application
2000	I-Application
Service	I-Application
Pack	I-Application
4	I-Application
,	O
Windows	B-Application
XP	I-Application
Service	I-Application
Pack	I-Application
1	I-Application
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
,	O
but	O
is	O
only	O
available	O
by	O
contacting	O
Microsoft	O
support	O
directly	O
.	O
</s>
<s>
However	O
,	O
almost	O
all	O
manufacturer	O
supplied	O
drivers	O
contain	O
the	O
UAA	O
class	B-Application
driver	I-Application
.	O
</s>
<s>
Windows	B-Application
XP	I-Application
Service	O
Pack	O
3	O
also	O
includes	O
the	O
updated	O
driver	O
,	O
as	O
well	O
as	O
Windows	B-Application
XP	I-Application
Professional	O
x64	O
Edition	O
with	O
Service	O
Pack	O
1	O
and	O
2	O
.	O
</s>
<s>
In	O
Windows	B-Application
Vista	I-Application
,	O
the	O
Windows	O
Logo	O
program	O
requirements	O
state	O
that	O
any	O
machine	O
shipped	O
with	O
Vista	B-Application
must	O
include	O
a	O
UAA-compliant	O
audio	O
device	O
that	O
works	O
without	O
additional	O
drivers	O
.	O
</s>
