<s>
The	O
Gravis	B-Application
UltraSound	I-Application
or	O
GUS	O
is	O
a	O
sound	B-Device
card	I-Device
for	O
the	O
IBM	O
PC	O
compatible	O
system	B-Device
platform	I-Device
,	O
made	O
by	O
Canada-based	O
Advanced	O
Gravis	O
Computer	O
Technology	O
Ltd	O
.	O
</s>
<s>
The	O
Gravis	B-Application
UltraSound	I-Application
was	O
notable	O
at	O
the	O
time	O
of	O
its	O
1992	O
launch	O
for	O
providing	O
the	O
IBM	O
PC	O
platform	O
with	O
sample-based	O
music	O
synthesis	O
technology	O
(	O
marketed	O
as	O
"	O
wavetable	O
"	O
)	O
,	O
that	O
is	O
the	O
ability	O
to	O
use	O
real-world	O
sound	O
recordings	O
rather	O
than	O
artificial	O
computer-generated	O
waveforms	O
as	O
the	O
basis	O
of	O
a	O
musical	O
instrument	O
.	O
</s>
<s>
With	O
up	O
to	O
32	O
hardware	O
audio	O
channels	O
,	O
the	O
GUS	O
was	O
notable	O
for	O
MIDI	O
playback	O
quality	O
with	O
a	O
large	O
set	O
of	O
instrument	O
patches	O
that	O
could	O
be	O
stored	O
in	O
its	O
own	O
RAM	B-Architecture
.	O
</s>
<s>
The	O
first	O
UltraSound	B-Application
was	O
released	O
in	O
,	O
along	O
with	O
the	O
Gravis	B-Device
PC	I-Device
GamePad	I-Device
.	O
</s>
<s>
The	O
Ultrasound	B-Application
was	O
one	O
of	O
the	O
first	O
PC	O
soundcards	B-Device
to	O
feature	O
16-bit	O
,	O
stereo	O
.	O
</s>
<s>
The	O
final	O
revision	O
(	O
v3.74	O
)	O
of	O
the	O
GUS	O
Classic	O
features	O
of	O
onboard	O
RAM	B-Architecture
(	O
upgradeable	O
to	O
1024	O
kB	O
through	O
DIP	B-Algorithm
sockets	O
)	O
,	O
hardware	O
analog	O
mixer	O
,	O
and	O
support	O
for	O
16-bit	O
recording	O
through	O
a	O
separate	O
daughterboard	O
based	O
on	O
the	O
Crystal	O
Semiconductor	O
CS4231	O
audio	O
codec	B-General_Concept
.	O
</s>
<s>
Computer	O
Gaming	O
World	O
in	O
1993	O
criticized	O
the	O
UltraSound	B-Application
's	O
Sound	B-Application
Blaster	I-Application
emulation	O
and	O
lack	O
of	O
native	O
support	O
in	O
games	O
,	O
stating	O
that	O
"	O
it	O
is	O
hard	O
to	O
recommend	O
this	O
card	O
to	O
anyone	O
other	O
than	O
a	O
Windows	O
MIDI	O
musician	O
"	O
.	O
</s>
<s>
Released	O
in	O
1994	O
,	O
UltraSound	B-Application
Max	O
is	O
a	O
version	O
of	O
the	O
GUS	O
with	O
a	O
CS4231	O
codec	B-General_Concept
on	O
board	O
,	O
512	O
kB	O
of	O
onboard	O
RAM	B-Architecture
(	O
upgradeable	O
to	O
1024	O
kB	O
with	O
a	O
single	O
SOJ	B-Algorithm
chip	O
)	O
,	O
and	O
Panasonic/Sony/Mitsumi	O
CD-ROM	B-Device
interface	O
slots	O
.	O
</s>
<s>
CS4231	O
provides	O
support	O
for	O
Windows	O
Sound	O
System	O
specs	O
,	O
although	O
the	O
IO	O
port	O
range	O
does	O
n't	O
match	O
the	O
WSS	O
hardware	O
,	O
and	O
can	O
be	O
used	O
for	O
SoundBlaster	B-Application
emulation	O
.	O
</s>
<s>
Released	O
in	O
1995	O
,	O
the	O
Ultrasound	B-Application
Plug	B-Device
&	I-Device
Play	I-Device
was	O
a	O
new	O
card	O
based	O
on	O
AMD	O
InterWave	O
technology	O
with	O
a	O
completely	O
different	O
sound	O
set	O
.	O
</s>
<s>
Supposedly	O
Synergy	O
acted	O
as	O
the	O
ODM-producer	O
for	O
it	O
(	O
as	O
evidenced	O
by	O
their	O
logo	O
on	O
the	O
rear	O
side	O
of	O
the	O
card	O
,	O
although	O
early	O
and	O
now	O
very	O
rare	O
GUS	O
PnP	B-Device
cards	O
did	O
not	O
have	O
the	O
Synergy	O
logo	O
)	O
.	O
</s>
<s>
The	O
card	O
features	O
1	O
MB	O
of	O
sound	O
ROM	B-Device
,	O
no	O
onboard	O
RAM	B-Architecture
(	O
although	O
it	O
can	O
be	O
expanded	O
to	O
8	O
MB	O
with	O
two	O
30-pin	O
SIMMs	B-General_Concept
)	O
,	O
and	O
an	O
ATAPI	O
CD-ROM	B-Device
interface	O
.	O
</s>
<s>
A	O
'	O
Pro	O
 '	O
version	O
adds	O
512	O
kB	O
of	O
on-board	O
RAM	B-Architecture
required	O
for	O
compatibility	O
with	O
the	O
GUS	O
Classic	O
.	O
</s>
<s>
In	O
2014	O
,	O
a	O
RAM	B-Architecture
adapter	O
for	O
the	O
72-pin	O
SIMM	B-General_Concept
was	O
produced	O
by	O
retro-computer	O
enthusiasts	O
that	O
made	O
it	O
possible	O
to	O
install	O
16	O
MB	O
of	O
RAM	B-Architecture
on	O
the	O
'	O
Pro	O
 '	O
version	O
without	O
any	O
modifications	O
to	O
the	O
card	O
.	O
</s>
<s>
Released	O
in	O
1995	O
,	O
this	O
budget	O
version	O
of	O
UltraSound	B-Application
Classic	O
has	O
512	O
kB	O
of	O
RAM	B-Architecture
(	O
upgradable	O
to	O
1024	O
kB	O
,	O
just	O
as	O
is	O
the	O
MAX	O
)	O
,	O
and	O
has	O
no	O
game	O
port	O
or	O
recording	O
ability	O
.	O
</s>
<s>
Marketed	O
as	O
a	O
competitor	O
to	O
Wave	O
Blaster-compatible	O
cards	O
,	O
it	O
is	O
supposed	O
to	O
be	O
installed	O
alongside	O
a	O
SoundBlaster	B-Application
Pro/16	O
card	O
as	O
a	O
sample-based	O
synthesis	O
(	O
marketed	O
as	O
'	O
wavetable	O
synthesis	O
 '	O
)	O
upgrade	O
.	O
</s>
<s>
An	O
OEM	O
version	O
of	O
UltraSound	B-Application
Classic	O
produced	O
by	O
Synergy	O
,	O
with	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
It	O
features	O
AT-BUS	O
CD-ROM	B-Device
interfaces	O
following	O
Sony	O
,	O
Mitsumi	O
and	O
MKE/Panasonic	O
standards	O
.	O
</s>
<s>
This	O
is	O
the	O
only	O
Gravis	O
sound	B-Device
card	I-Device
with	O
a	O
green	O
circuit	O
board	O
.	O
</s>
<s>
Released	O
in	O
1996	O
,	O
the	O
UltraSound	B-Application
Extreme	O
is	O
a	O
3rd	O
party	O
OEM	O
system	O
combining	O
the	O
UltraSound	B-Application
Classic	O
with	O
an	O
ESS	O
AudioDrive	O
ES1688	O
sound	O
chip	O
for	O
Sound	B-Application
Blaster	I-Application
Pro	I-Application
and	O
AdLib	O
emulation	O
.	O
</s>
<s>
It	O
has	O
1MB	O
RAM	B-Architecture
by	O
default	O
,	O
but	O
cannot	O
be	O
upgraded	O
any	O
further	O
.	O
</s>
<s>
Re-labeled	O
Altrasound	O
as	O
Sound	O
M-16B	O
and	O
different	O
Sound	O
M-16C	O
with	O
4x	O
CD-ROM	B-Device
Interfaces	O
.	O
</s>
<s>
D&B	O
UltraWave	O
(	O
GF1	O
)	O
-	O
this	O
card	O
has	O
onboard	O
RAM	B-Architecture
by	O
default	O
,	O
upgradeable	O
to	O
RAM	B-Architecture
using	O
a	O
SOJ-40	O
DRAM	O
chip	O
.	O
</s>
<s>
Has	O
a	O
DIP	B-Algorithm
socket	O
for	O
a	O
boot	O
ROM	B-Device
(	O
optional	O
)	O
and	O
an	O
IDE	O
interface	O
(	O
secondary	O
)	O
.	O
</s>
<s>
Synergy	O
ViperMAX	O
(	O
GF1	O
)	O
-	O
same	O
card	O
later	O
repacked	O
as	O
UltraSound	B-Application
Extreme	O
,	O
but	O
with	O
only	O
RAM	B-Architecture
on	O
board	O
.	O
</s>
<s>
STB	O
Systems	O
Soundrage	O
32	O
(	O
InterWave	O
)	O
-	O
standard	O
InterWave	O
card	O
missing	O
SIMM	B-General_Concept
slots	O
and	O
IDE	O
interface	O
.	O
</s>
<s>
There	O
was	O
"	O
Pro	O
"	O
variant	O
with	O
512	O
kB	O
RAM	B-Architecture
.	O
</s>
<s>
Core	O
Dynamics	O
DYNASonix	O
3D/PRO	O
(	O
InterWave	O
)	O
-	O
features	O
additional	O
DSP	B-Architecture
chip	I-Architecture
that	O
offered	O
a	O
graphic	O
equalizer	O
and	O
additional	O
sound	O
FX	O
presets	O
.	O
</s>
<s>
Has	O
a	O
footprint	O
for	O
512kb	O
RAM	B-Architecture
,	O
often	O
left	O
unpopulated	O
.	O
</s>
<s>
Comes	O
without	O
RAM	B-Architecture
and	O
has	O
no	O
sockets/footprints	O
to	O
add	O
any	O
.	O
</s>
<s>
The	O
GF1	O
was	O
co-developed	O
by	O
Advanced	O
Gravis	O
and	O
Forte	O
Technologies	O
(	O
creator	O
of	O
the	O
VFX1	B-Device
Headgear	I-Device
virtual	B-Application
reality	I-Application
helmet	O
)	O
and	O
produced	O
by	O
Integrated	O
Circuit	O
Systems	O
under	O
the	O
ICS11614	O
moniker	O
.	O
</s>
<s>
The	O
GF1	O
is	O
purely	O
a	O
sample-based	O
synthesis	O
chip	O
with	O
the	O
polyphony	O
of	O
32	O
oscillators	O
,	O
so	O
it	O
can	O
mix	O
up	O
to	O
32	O
mono	O
PCM	B-Algorithm
samples	O
or	O
16	O
stereo	O
samples	O
entirely	O
in	O
hardware	O
.	O
</s>
<s>
The	O
chip	O
has	O
no	O
built-in	O
codec	B-General_Concept
,	O
so	O
the	O
sounds	O
must	O
be	O
downloaded	O
to	O
onboard	O
RAM	B-Architecture
prior	O
to	O
playback	O
.	O
</s>
<s>
Sound	O
compression	O
algorithms	O
such	O
as	O
IMA	B-Algorithm
ADPCM	I-Algorithm
are	O
not	O
supported	O
,	O
so	O
compressed	O
samples	O
must	O
be	O
decompressed	O
prior	O
to	O
loading	O
.	O
</s>
<s>
However	O
,	O
software	O
simulation	O
is	O
possible	O
;	O
a	O
basic	O
"	O
echo	O
"	O
effect	O
can	O
be	O
simulated	O
with	O
additional	O
tracks	O
,	O
and	O
some	O
trackers	B-Application
can	O
program	O
effects	O
using	O
additional	O
hardware	O
voices	O
as	O
accumulators	O
.	O
</s>
<s>
The	O
UltraSound	B-Application
offers	O
MIDI	O
playback	O
by	O
loading	O
instrument	O
patches	O
into	O
adapter	O
RAM	B-Architecture
located	O
on	O
the	O
card	O
,	O
not	O
unlike	O
how	O
instruments	O
are	O
stored	O
in	O
ROM	B-Device
on	O
other	O
sample-based	O
cards	O
(	O
marketed	O
as	O
"	O
wavetable	O
"	O
cards	O
)	O
.	O
</s>
<s>
The	O
card	O
comes	O
with	O
a	O
5.6	O
MB	O
set	O
of	O
instrument	O
patch	O
( *	O
.PAT	O
)	O
files	O
;	O
most	O
patches	O
are	O
sampled	O
at	O
16-bit	O
resolution	O
and	O
looped	B-Application
to	O
save	O
space	O
.	O
</s>
<s>
Windows	O
95	O
and	O
98	O
drivers	O
use	O
UltraSound.INI	O
to	O
load	O
the	O
patch	O
files	O
on	O
demand	O
.	O
</s>
<s>
In	O
DOS	B-Device
,	O
the	O
loading	O
of	O
the	O
patches	O
can	O
be	O
handled	O
by	O
UltraMID	O
,	O
a	O
middleware	B-General_Concept
TSR	O
system	O
provided	O
by	O
Gravis	O
that	O
removes	O
the	O
need	O
to	O
handle	O
the	O
hardware	O
directly	O
.	O
</s>
<s>
The	O
application	O
programmer	O
can	O
choose	O
to	O
preload	O
all	O
patches	O
from	O
disk	O
,	O
resizing	O
as	O
necessary	O
to	O
fit	O
into	O
the	O
UltraSound	B-Application
's	O
on-board	O
RAM	B-Architecture
,	O
or	O
have	O
the	O
middleware	B-General_Concept
track	O
the	O
patch	O
change	O
events	O
and	O
dynamically	O
load	O
them	O
on	O
demand	O
.	O
</s>
<s>
Each	O
application	O
can	O
have	O
its	O
own	O
UltraMID.INI	O
containing	O
a	O
set	O
of	O
patch	O
substitutions	O
for	O
every	O
possible	O
amount	O
of	O
sample	O
RAM	B-Architecture
(	O
256/512/768/1024	O
kB	O
)	O
,	O
so	O
that	O
similar	O
instruments	O
are	O
used	O
when	O
there	O
is	O
not	O
enough	O
RAM	B-Architecture
to	O
hold	O
all	O
of	O
the	O
patches	O
needed	O
(	O
even	O
after	O
resampling	O
to	O
smaller	O
sizes	O
)	O
.	O
</s>
<s>
Some	O
games	O
—	O
including	O
Doom	B-Application
,	O
Doom	B-Application
II	I-Application
and	O
Duke	B-Application
Nukem	I-Application
3D	I-Application
—	O
come	O
with	O
their	O
own	O
optimized	O
UltraMID.INI	O
.	O
</s>
<s>
The	O
UltraSound	B-Application
cards	O
gained	O
great	O
popularity	O
in	O
the	O
PC	O
tracker	B-Application
music	O
community	O
.	O
</s>
<s>
The	O
tracker	B-Application
format	O
was	O
originally	O
developed	O
on	O
the	O
Commodore	B-Device
Amiga	I-Device
personal	O
computer	O
in	O
1987	O
,	O
but	O
due	O
to	O
the	O
PC	O
becoming	O
more	O
capable	O
of	O
producing	O
high-quality	O
graphics	O
and	O
sound	O
,	O
the	O
demoscene	O
spilled	O
out	O
onto	O
the	O
platform	O
in	O
droves	O
and	O
took	O
the	O
tracker	B-Application
format	O
with	O
it	O
.	O
</s>
<s>
Typical	O
tracker	B-Application
formats	O
of	O
the	O
era	O
included	O
MOD	O
,	O
S3M	O
,	O
and	O
later	O
XM	O
.	O
</s>
<s>
The	O
format	O
stores	O
the	O
notes	O
and	O
instruments	O
digitally	O
in	O
the	O
file	O
instead	O
of	O
relying	O
on	O
a	O
sound	B-Device
card	I-Device
to	O
reproduce	O
the	O
instruments	O
.	O
</s>
<s>
A	O
tracker	B-Application
module	O
,	O
when	O
saved	O
to	O
disk	O
,	O
typically	O
incorporates	O
all	O
the	O
sequencing	O
data	O
and	O
samples	O
,	O
and	O
typically	O
the	O
composer	O
would	O
incorporate	O
their	O
assumed	O
name	O
into	O
the	O
list	O
of	O
samples	O
.	O
</s>
<s>
The	O
problem	O
with	O
other	O
sound	B-Device
cards	I-Device
playing	O
these	O
formats	O
was	O
that	O
they	O
had	O
to	O
downmix	O
voices	O
into	O
one	O
or	O
both	O
of	O
its	O
output	O
channels	O
in	O
software	O
,	O
further	O
deteriorating	O
the	O
quality	O
of	O
8-bit	O
samples	O
in	O
the	O
process	O
.	O
</s>
<s>
An	O
UltraSound	B-Application
card	O
was	O
able	O
to	O
download	O
the	O
samples	O
to	O
its	O
RAM	B-Architecture
and	O
mix	O
them	O
using	O
fast	O
and	O
high-quality	O
hardware	O
implementation	O
,	O
offloading	O
the	O
CPU	O
from	O
the	O
task	O
.	O
</s>
<s>
As	O
the	O
GF1	O
chip	O
does	O
not	O
contain	O
AdLib-compatible	O
OPL2	O
circuitry	O
or	O
a	O
codec	B-General_Concept
chip	O
,	O
Sound	B-Application
Blaster	I-Application
compatibility	O
was	O
difficult	O
to	O
achieve	O
at	O
best	O
.	O
</s>
<s>
Consumers	O
were	O
expected	O
to	O
use	O
the	O
included	O
emulation	O
software	O
to	O
emulate	O
other	O
standards	O
,	O
an	O
activity	O
not	O
necessary	O
with	O
many	O
other	O
cards	O
that	O
emulated	O
the	O
Sound	B-Application
Blaster	I-Application
through	O
their	O
sound	O
hardware	O
.	O
</s>
<s>
The	O
emulation	O
software	O
ran	O
as	O
a	O
huge	O
TSR	O
that	O
was	O
difficult	O
to	O
manage	O
in	O
the	O
pre-Windows	O
days	O
of	O
complicated	O
DOS	B-Device
extenders	I-Device
.	O
</s>
<s>
Although	O
there	O
was	O
native	O
support	O
for	O
many	O
popular	O
games	O
that	O
used	O
middleware	B-General_Concept
sound	O
libraries	O
like	O
HMI	O
(	O
Human	O
Machine	O
Interfaces	O
)	O
Sound	O
Operating	O
System	O
,	O
the	O
Miles	O
Audio	B-Library
Interface	I-Library
Libraries	I-Library
(	O
AIL	O
)	O
,	O
the	O
Miles	B-Library
Sound	I-Library
System	I-Library
or	O
others	O
,	O
the	O
user	O
had	O
to	O
patch	O
the	O
games	O
by	O
replacing	O
the	O
existing	O
sound	O
drivers	O
with	O
the	O
UltraSound	B-Application
versions	O
provided	O
on	O
the	O
installation	O
CD	O
.	O
</s>
<s>
Also	O
,	O
the	O
UltraSound	B-Application
required	O
two	O
DMA	B-General_Concept
channels	O
for	O
full-duplex	O
operation	O
,	O
and	O
16-bit	O
channels	O
were	O
generally	O
faster	O
,	O
so	O
many	O
users	O
chose	O
to	O
use	O
them	O
,	O
but	O
this	O
led	O
to	O
errors	O
for	O
games	O
that	O
used	O
the	O
DOS/4GW	B-Application
DOS	B-Device
extender	I-Device
,	O
which	O
was	O
common	O
in	O
the	O
UltraSound	B-Application
's	O
era	O
.	O
</s>
<s>
SBOS	O
,	O
Sound	O
Board	O
OS	O
—	O
Sound	B-Application
Blaster	I-Application
Pro	I-Application
8-bit	O
stereo	O
emulation	O
and	O
AdLib	O
FM	O
synthesis	O
.	O
</s>
<s>
It	O
was	O
a	O
real-mode	O
software	O
emulator	O
that	O
recreated	O
the	O
AdLib	O
's	O
OPL2	O
FM	O
synth	O
chip	O
and	O
required	O
that	O
the	O
user	O
have	O
a	O
286	B-General_Concept
processor	O
or	O
better	O
.	O
</s>
<s>
There	O
were	O
special	O
versions	O
for	O
the	O
UltraSound	B-Application
MAX	O
(	O
MAXSBOS	O
)	O
and	O
AMD	O
InterWave-based	O
cards	O
(	O
IWSBOS	O
)	O
,	O
which	O
made	O
use	O
of	O
the	O
CS4231	O
codec	B-General_Concept
chip	O
instead	O
.	O
</s>
<s>
Mega-Em	O
—	O
advanced	O
emulation	O
software	O
that	O
required	O
at	O
least	O
a	O
386	B-General_Concept
processor	O
and	O
EMM	B-Device
manager	O
with	O
DPMI/VCPI	O
support	O
.	O
</s>
<s>
Mega-Em	O
emulated	O
the	O
8-bit	O
Sound	B-Application
Blaster	I-Application
circuitry	O
for	O
sound	O
effects	O
and	O
the	O
Roland	O
MT-32/LAPC	O
-I	O
or	O
Roland	O
Sound	O
Canvas/MPU	O
-401	O
for	O
music	O
.	O
</s>
<s>
The	O
great	O
potential	O
of	O
the	O
original	O
UltraSound	B-Application
enabled	O
Advanced	O
Gravis	O
to	O
license	O
the	O
new	O
GFA1	O
chip	O
and	O
software	O
to	O
AMD	O
,	O
who	O
were	O
trying	O
to	O
enter	O
the	O
sound	O
chip	O
market	O
at	O
the	O
time	O
.	O
</s>
<s>
It	O
was	O
compatible	O
with	O
CS4231	O
codec	B-General_Concept
installed	O
in	O
the	O
UltraSound	B-Application
MAX	O
or	O
16-bit	O
recording	O
daughterboard	O
for	O
the	O
UltraSound	B-Application
Classic	O
.	O
</s>
<s>
The	O
sound	O
"	O
patch	O
set	O
"	O
was	O
reworked	O
from	O
a	O
collection	O
of	O
individual	O
instrument	O
.PAT	O
files	O
to	O
a	O
unified	O
.FFF/.DAT	O
sound	O
bank	O
format	O
,	O
resembling	O
SoundFont	B-Application
,	O
which	O
could	O
be	O
either	O
ROM	B-Device
or	O
RAM	B-Architecture
based	O
.	O
</s>
<s>
There	O
were	O
4	O
versions	O
of	O
the	O
sound	O
bank	O
:	O
a	O
full	O
16-bit	O
4	O
MB	O
with	O
8-bit	O
downsampled	O
2	O
MB	O
version	O
,	O
and	O
16-bit	O
2	O
MB	O
(	O
different	O
sample	O
looping	B-Application
)	O
with	O
8-bit	O
downsampled	O
1	O
MB	O
version	O
.	O
</s>
<s>
The	O
reference	O
card	O
contained	O
a	O
1	O
MB	O
μ-law	B-Algorithm
ADPCM	B-Algorithm
compressed	O
sound	O
ROM	B-Device
,	O
which	O
contained	O
basic	O
General	O
MIDI	O
voices	O
and	O
sound	O
samples	O
to	O
help	O
FM	O
emulation	O
,	O
and	O
2	O
slots	O
for	O
RAM	B-Architecture
expansion	O
through	O
30-pin	O
SIMMs	B-General_Concept
.	O
</s>
<s>
The	O
IWSBOS	O
emulator	O
was	O
reworked	O
to	O
include	O
Mega-Em	O
features	O
such	O
as	O
General	O
MIDI	O
emulation	O
,	O
and	O
the	O
SBOS	O
kernel	O
was	O
included	O
in	O
Windows	O
95	O
drivers	O
to	O
provide	O
emulation	O
in	O
a	O
DOS	B-Application
Box	I-Application
window	O
.	O
</s>
<s>
The	O
process	O
of	O
patching	O
middleware	B-General_Concept
sound	O
'	O
drivers	O
 '	O
was	O
greatly	O
simplified	O
with	O
PREPGAME	O
utility	O
,	O
which	O
could	O
fix	O
most	O
known	O
DOS	B-Device
games	O
automatically	O
either	O
by	O
correctly	O
installing	O
and	O
configuring	O
native	O
InterWave	O
drivers	O
or	O
replacing	O
the	O
binaries	O
for	O
some	O
rare	O
devices	O
like	O
Covox	O
.	O
</s>
<s>
It	O
could	O
also	O
update	O
DOS/4GW	B-Application
extender	O
to	O
work	O
around	O
its	O
16-bit	O
DMA	B-General_Concept
bug	O
.	O
</s>
<s>
The	O
GFA1	O
featured	O
a	O
GUS/MAX	O
compatibility	O
mode	O
,	O
but	O
the	O
base	O
card	O
was	O
not	O
compatible	O
with	O
the	O
UltraSound	B-Application
Classic	O
unless	O
some	O
memory	O
was	O
installed	O
.	O
</s>
<s>
The	O
InterWave	O
technology	O
was	O
used	O
in	O
the	O
Gravis	B-Application
UltraSound	I-Application
PnP	B-Device
line	O
of	O
cards	O
.	O
</s>
<s>
Some	O
high-end	O
OEM	O
variants	O
contained	O
a	O
full-blown	O
4	O
MB	O
patch	O
set	O
in	O
ROM	B-Device
and	O
proprietary	O
hardware	O
DSPs	B-Architecture
to	O
enable	O
features	O
like	O
additional	O
sound	O
effect	O
algorithms	O
and	O
graphic	O
equalizer	O
.	O
</s>
<s>
On	O
the	O
user-side	O
,	O
the	O
Sound	B-Application
Blaster	I-Application
emulation	O
was	O
especially	O
hard	O
to	O
get	O
right	O
out	O
of	O
the	O
box	O
,	O
and	O
this	O
resulted	O
in	O
a	O
substantially	O
high	O
number	O
of	O
product	O
returns	O
at	O
the	O
store	O
level	O
and	O
thus	O
soured	O
the	O
retail	O
channel	O
on	O
the	O
product	O
.	O
</s>
<s>
But	O
without	O
the	O
marketing	O
and	O
developer	O
presence	O
of	O
Creative	O
Labs	O
,	O
Gravis	O
could	O
not	O
generate	O
either	O
the	O
sales	O
or	O
support	O
required	O
for	O
the	O
Gravis	O
soundcard	B-Device
to	O
compete	O
in	O
the	O
mainstream	O
market	O
against	O
the	O
de	O
facto	O
standard	O
Soundblaster	B-Application
.	O
</s>
<s>
Although	O
the	O
InterWave	O
chip	O
was	O
a	O
substantially	O
improved	O
version	O
of	O
the	O
GF1	O
chip	O
,	O
this	O
new	O
design	O
was	O
not	O
able	O
to	O
hold	O
up	O
with	O
the	O
Sound	B-Device
Blaster	I-Device
AWE32	I-Device
.	O
</s>
<s>
Due	O
to	O
dwindling	O
sales	O
,	O
Gravis	O
was	O
eventually	O
forced	O
out	O
of	O
the	O
soundcard	B-Device
business	O
,	O
and	O
the	O
UltraSound	B-Application
's	O
failure	O
nearly	O
took	O
the	O
entire	O
company	O
down	O
with	O
it	O
.	O
</s>
<s>
Advanced	O
Gravis	O
,	O
once	O
one	O
of	O
the	O
dominant	O
players	O
in	O
the	O
PC	O
peripherals	O
marketplace	O
,	O
had	O
bet	O
much	O
of	O
the	O
future	O
of	O
the	O
company	O
on	O
the	O
UltraSound	B-Application
and	O
paid	O
the	O
price	O
for	O
its	O
demise	O
.	O
</s>
<s>
Shareholders	O
sued	O
the	O
company	O
charging	O
gross	O
incompetence	O
by	O
its	O
management	O
,	O
in	O
regards	O
to	O
the	O
entire	O
UltraSound	B-Application
effort	O
.	O
</s>
