<s>
mp3DirectCut	B-Application
is	O
a	O
lossless	O
editor	O
for	O
MP3	B-Application
(	O
and	O
to	O
a	O
degree	O
,	O
MP2	O
and	O
AAC	B-Application
)	O
audio	O
files	O
,	O
able	O
to	O
provide	O
cuts	O
and	O
crops	O
,	O
copy	O
and	O
paste	O
,	O
gain	O
and	O
fades	O
to	O
audio	O
files	O
without	O
having	O
to	O
decode	O
or	O
re-encode	O
the	O
audio	O
.	O
</s>
<s>
This	O
allows	O
for	O
rapid	O
,	O
lossless	O
MP3	B-Application
audio	I-Application
editing	O
that	O
does	O
not	O
degrade	O
the	O
data	O
from	O
re-encoding	O
.	O
</s>
<s>
mp3DirectCut	B-Application
provides	O
audio	O
normalization	O
and	O
pause	O
(	O
silence	O
)	O
detection	O
,	O
and	O
can	O
split	O
long	O
recordings	O
into	O
separate	O
files	O
based	O
on	O
cue	O
points	O
in	O
the	O
audio	O
,	O
such	O
as	O
those	O
provided	O
by	O
pause	O
detection	O
.	O
</s>
<s>
mp3DirectCut	B-Application
can	O
also	O
record	O
audio	O
directly	O
to	O
MP3	B-Application
from	O
the	O
computer	O
's	O
sound	O
card	O
input	O
.	O
</s>
<s>
All	O
audio	O
operations	O
are	O
performed	O
using	O
frame	O
manipulation	O
so	O
,	O
as	O
such	O
,	O
mp3DirectCut	B-Application
is	O
not	O
a	O
waveform	O
editor	O
.	O
</s>
<s>
An	O
MP3	B-Application
file	I-Application
can	O
be	O
edited	O
without	O
transcoding	O
.	O
</s>
<s>
Edit	O
positions	O
in	O
the	O
file	O
can	O
be	O
placed	O
only	O
at	O
the	O
start	O
of	O
an	O
MP3	B-Application
frame	O
(	O
of	O
which	O
there	O
are	O
typically	O
about	O
38	O
per	O
second	O
)	O
.	O
</s>
<s>
Gains	O
and	O
fades	O
are	O
limited	O
to	O
1.5dB	O
steps	O
,	O
as	O
they	O
are	O
achieved	O
by	O
modifying	O
the	O
value	O
of	O
the	O
MP3	B-Application
frame	O
's	O
8-bit	O
global	O
gain	O
field	O
.	O
</s>
<s>
This	O
is	O
equivalent	O
to	O
about	O
28	O
hours	O
of	O
music	O
in	O
an	O
MP3	B-Application
file	I-Application
encoded	O
at	O
320	O
kbit/s	O
.	O
</s>
<s>
The	O
documentation	O
warns	O
that	O
navigating	O
a	O
song	O
does	O
not	O
,	O
in	O
all	O
cases	O
,	O
land	O
on	O
the	O
start	O
of	O
an	O
MP3	B-Application
frame	O
.	O
</s>
<s>
This	O
may	O
limit	O
the	O
ability	O
to	O
further	O
amplify	O
the	O
recording	O
with	O
MP3DirectCut	B-Application
without	O
causing	O
clipping	O
.	O
</s>
<s>
If	O
MP4	O
audio	O
files	O
need	O
to	O
be	O
processed	O
,	O
the	O
AAC	B-Application
audio	O
stream	O
needs	O
to	O
be	O
extracted	O
first	O
,	O
e.g.	O
</s>
<s>
with	O
mp4box	O
(	O
Simply	O
renaming	O
an	O
.MP4	O
file	O
to	O
.AAC	B-Application
does	O
not	O
work	O
,	O
since	O
a	O
simply	O
renamed	O
file	O
still	O
contains	O
an	O
MP4	O
container	O
file	O
header	O
)	O
.	O
</s>
