<s>
Vinyl	O
emulation	B-Application
allows	O
a	O
user	O
to	O
physically	O
manipulate	O
the	O
playback	O
of	O
digital	O
audio	O
files	O
on	O
a	O
computer	O
using	O
the	O
turntables	O
as	O
an	O
interface	O
,	O
thus	O
preserving	O
the	O
hands-on	O
control	O
and	O
feel	O
of	O
DJing	O
with	O
vinyl	O
.	O
</s>
<s>
Vinyl	O
emulation	B-Application
normally	O
uses	O
special	O
vinyl	O
records	O
which	O
are	O
played	O
on	O
conventional	O
turntables	O
.	O
</s>
<s>
This	O
ADC	O
may	O
be	O
a	O
multi-channel	O
soundcard	B-Device
or	O
a	O
dedicated	O
external	O
USB	B-Protocol
or	O
FireWire	B-Protocol
audio	O
interface	O
box	O
,	O
DJ	O
controller	O
device	O
or	O
compatible	O
mixer	O
(	O
usually	O
distributed	O
with	O
the	O
software	O
)	O
.	O
</s>
<s>
The	O
manipulated	O
audio	O
output	O
of	O
the	O
program	O
is	O
then	O
sent	O
back	O
through	O
the	O
DAC	O
or	O
the	O
computer	O
's	O
sound	B-Device
card	I-Device
,	O
and	O
can	O
be	O
routed	O
into	O
an	O
audio	O
mixer	O
where	O
it	O
can	O
be	O
mixed	O
like	O
any	O
other	O
analog	O
audio	O
signal	O
.	O
</s>
<s>
The	O
delay	O
time	O
is	O
treated	O
as	O
a	O
figure	O
of	O
merit	O
for	O
vinyl	O
emulation	B-Application
products	O
.	O
</s>
<s>
In	O
some	O
countries	O
,	O
for	O
example	O
Finland	O
,	O
a	O
digital	O
DJ	O
license	O
is	O
required	O
to	O
legally	O
play	O
copyrighted	O
music	O
publicly	O
with	O
vinyl	O
emulation	B-Application
software	I-Application
.	O
</s>
<s>
Final	B-Application
Scratch	I-Application
was	O
the	O
first	O
vinyl	O
emulation	B-Application
software	I-Application
sold	O
publicly	O
.	O
</s>
<s>
Notable	O
applications	O
licensed	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
:	O
</s>
<s>
Notable	O
proprietary	B-Application
software	I-Application
applications	O
include	O
:	O
</s>
<s>
Some	O
vinyl	O
emulation	B-Application
software	I-Application
products	O
are	O
marketed	O
with	O
specific	O
time	O
coded	O
vinyl	O
,	O
while	O
others	O
are	O
software-only	O
products	O
.	O
</s>
