<s>
Extempore	B-Application
is	O
a	O
live	O
coding	O
environment	O
focused	O
on	O
real-time	B-General_Concept
audiovisual	O
software	O
development	O
.	O
</s>
<s>
Extempore	B-Application
consists	O
of	O
two	O
integrated	O
languages	O
,	O
Scheme	B-Language
(	O
with	O
extensions	O
)	O
and	O
Extempore	B-Application
Language	O
.	O
</s>
<s>
It	O
uses	O
the	O
LLVM	B-Application
cross-language	O
compiler	O
to	O
achieve	O
performant	O
digital	B-General_Concept
signal	I-General_Concept
processing	I-General_Concept
and	O
related	O
low-level	O
features	O
,	O
on-the-fly	O
.	O
</s>
<s>
Extempore	B-Application
shares	O
the	O
use	O
of	O
Scheme	B-Language
syntax	O
,	O
real-time	B-General_Concept
audiovisual	O
emphasis	O
and	O
lead	O
developer	O
Andrew	O
Sorensen	O
with	O
the	O
older	O
and	O
related	O
project	O
Impromptu	B-Language
.	O
</s>
<s>
It	O
runs	O
under	O
both	O
Linux	B-Application
and	O
Mac	B-Device
OS	I-Device
X	I-Device
.	O
</s>
