<s>
Spire	B-Application
is	O
the	O
first	O
software	B-Application
synthesizer	I-Application
developed	O
by	O
Reveal	O
Sound	O
.	O
</s>
<s>
Spire	B-Application
combines	O
elements	O
from	O
both	O
Analog	O
and	O
software	B-Application
synthesizers	I-Application
.	O
</s>
<s>
The	O
software	O
can	O
be	O
run	O
by	O
itself	O
or	O
within	O
a	O
digital	B-General_Concept
audio	I-General_Concept
workstation	I-General_Concept
.	O
</s>
<s>
Spire	B-Application
combines	O
multiple	O
forms	O
of	O
digital	O
synthesis	O
with	O
reproductions	O
of	O
classic	O
analog	O
synthesis	O
techniques	O
.	O
</s>
<s>
The	O
synthesis	O
techniques	O
used	O
by	O
Spire	B-Application
are	O
most	O
easily	O
described	O
as	O
subtractive	O
,	O
although	O
the	O
options	O
available	O
are	O
much	O
more	O
complex	O
than	O
most	O
real	O
analog	O
synthesizers	O
.	O
</s>
<s>
The	O
sounds	O
from	O
the	O
four	O
oscillators	O
can	O
then	O
be	O
routed	O
to	O
the	O
modulation	O
units	O
,	O
which	O
include	O
four	O
envelopes	B-Algorithm
,	O
four	O
Low	O
Frequency	O
Oscillators	O
,	O
two	O
step	O
sequencers	O
,	O
and	O
routing	O
matrix	O
.	O
</s>
