<s>
Protracker	B-Device
is	O
a	O
music	B-Application
tracker	I-Application
for	O
the	O
Amiga	B-Device
platform	I-Device
.	O
</s>
<s>
Protracker	B-Device
allows	O
the	O
user	O
to	O
create	O
sequences	O
of	O
notes	O
called	O
"	O
patterns	O
"	O
,	O
which	O
are	O
chained	O
together	O
to	O
form	O
a	O
complete	O
song	O
.	O
</s>
<s>
Music	O
created	O
in	O
Protracker	B-Device
uses	O
the	O
MOD	O
file	O
format	O
.	O
</s>
<s>
It	O
was	O
initially	O
developed	O
for	O
the	O
Amiga	B-Device
line	O
of	O
computers	O
,	O
but	O
was	O
later	O
made	O
available	O
for	O
other	O
platforms	O
such	O
as	O
the	O
Atari	B-Device
ST	I-Device
.	O
</s>
<s>
Building	O
upon	O
the	O
features	O
of	O
previous	O
trackers	B-Application
such	O
as	O
Ultimate	B-Device
Soundtracker	I-Device
and	O
NoiseTracker	B-Device
(	O
of	O
which	O
Protracker	B-Device
's	O
code	O
is	O
based	O
on	O
)	O
,	O
Protracker	B-Device
came	O
equipped	O
with	O
a	O
built-in	O
sample	O
editor	O
and	O
a	O
keyboard	O
split	O
function	O
to	O
assign	O
multiple	O
instruments	O
to	O
different	O
regions	O
of	O
the	O
keyboard	O
.	O
</s>
<s>
Protracker	B-Device
is	O
capable	O
of	O
playing	O
back	O
music	O
at	O
the	O
correct	O
speed	O
on	O
both	O
NTSC	O
and	O
PAL	B-Language
computers	O
.	O
</s>
<s>
Previous	O
tracker	B-Application
software	O
used	O
playback	O
routines	O
which	O
were	O
synchronized	O
to	O
the	O
refresh	O
rate	O
of	O
the	O
screen	O
,	O
which	O
would	O
cause	O
music	O
composed	O
on	O
one	O
standard	O
to	O
sound	O
incorrect	O
on	O
computers	O
of	O
the	O
other	O
standard	O
due	O
to	O
the	O
differing	O
refresh	O
rates	O
.	O
</s>
<s>
There	O
is	O
an	O
ongoing	O
effort	O
since	O
2010	O
to	O
make	O
an	O
open	B-Application
source	I-Application
software	I-Application
clone	B-General_Concept
of	O
Protracker	B-Device
for	O
modern	O
platforms	O
at	O
GitHub	B-Application
.	O
</s>
<s>
The	O
also	O
"	O
ProTracker	B-Device
2.3D	O
clone	B-General_Concept
"	O
named	O
software	O
is	O
developed	O
under	O
the	O
BSD	O
3-Clause	O
License	O
and	O
available	O
for	O
Windows	O
,	O
Linux	B-Application
,	O
and	O
macOS	B-Application
.	O
</s>
