<s>
Open-Architecture-System	B-Application
(	O
OAS	O
)	O
is	O
the	O
main	O
User	B-Application
interface	I-Application
and	O
synthesizer	O
software	O
of	O
the	O
Wersi	O
keyboard	O
line	O
.	O
</s>
<s>
OAS	O
can	O
host	O
up	O
to	O
4	O
separate	O
VST	B-Application
software	O
instruments	O
,	O
allowing	O
for	O
an	O
expandable	O
system	O
similar	O
to	O
the	O
Korg	O
OASYS	O
.	O
</s>
<s>
This	O
software	O
enables	O
the	O
Wersi	O
to	O
use	O
all	O
Yamaha	O
styles	O
,	O
including	O
those	O
from	O
the	O
Tyros	B-Application
2	I-Application
.	O
</s>
