<s>
FreeMIDI	B-Application
was	O
a	O
popular	O
virtual	O
studio	O
management	O
application	O
by	O
Mark	O
of	O
the	O
Unicorn	O
(	O
MOTU	O
)	O
for	O
the	O
Classic	B-Application
Mac	I-Application
OS	I-Application
.	O
</s>
<s>
It	O
was	O
used	O
to	O
mimic	O
the	O
physical	O
setup	O
of	O
MIDI	O
devices	O
that	O
are	O
connected	O
to	O
the	O
computer	O
and	O
provide	O
applications	O
and	O
the	O
Mac	B-Application
OS	I-Application
a	O
way	O
for	O
referencing	O
them	O
.	O
</s>
<s>
OMS	B-Operating_System
by	O
Opcode	O
also	O
performed	O
similar	O
duties	O
.	O
</s>
<s>
Some	O
MIDI	O
interfaces	O
provided	O
drivers	O
for	O
both	O
FreeMIDI	B-Application
and	O
OMS	B-Operating_System
,	O
while	O
some	O
only	O
included	O
drivers	O
for	O
one	O
or	O
the	O
other	O
.	O
</s>
<s>
FreeMIDI	B-Application
included	O
an	O
OMS	B-Operating_System
Compatibility	O
Mode	O
which	O
allowed	O
FreeMIDI	B-Application
to	O
communicate	O
with	O
devices	O
in	O
OMS	B-Operating_System
.	O
</s>
<s>
Under	O
macOS	B-Application
,	O
neither	O
FreeMIDI	B-Application
or	O
OMS	B-Operating_System
are	O
used	O
,	O
as	O
those	O
duties	O
are	O
covered	O
by	O
macOS	B-Application
's	O
included	O
Audio	O
MIDI	O
Setup	O
utility	O
.	O
</s>
<s>
For	O
those	O
who	O
still	O
have	O
or	O
use	O
Macs	O
that	O
can	O
only	O
run	O
Classic	B-Application
Mac	I-Application
OS	I-Application
,	O
OMS	B-Operating_System
still	O
exists	O
in	O
select	O
music	O
app	O
archives	O
online	O
.	O
</s>
