Date:04-16-05

Mel Lambert
Media&Marketing
+1/818.558-3924
mediapr@earthlink.net

Las Vegas Convention Center, NV: During the NAB 2005 Convention Exposition, which opens here today and runs through April 21, Graham-Patten Systems will underscore its continuing commitment to the international broadcast and post-production markets, by developing leading-edge digital audio edit suite mixers, interface and conversion accessories. Founded in 1980, Graham-Patten has established a reputation as the world's leading developer of high performance digital audio products for the professional video industry. The company is best known for its Emmy® award-winning D/ESAM Digital Edit Suite Audio Mixers. Throughout the video industry, Graham-Patten is recognized for its technical innovation, product reliability and outstanding customer support. The ISIS Group acquired Graham-Patten Systems in October 2004 from Klotz Digital America.

Graham-Patten Systems is now co-located with The ISIS Group in Grass Valley, CA. This newly formed division of The ISIS Group will continue to produce its existing high quality range of products, and there will be a strong emphasis on the development of Graham-Patten Systems' next generation of audio mixing, conversion and distribution products targeted to meet current and future market needs.

"We respect the fact that GPS has a loyal customer base and world-wide distribution network," says Tom Vick, General Manager. "That loyalty is of great value. For us at GPS, ISIS has been such a natural fit; we are all committed to providing our customers and distributors with the best possible service."

"This has been a great merger for both companies," Steve Block, ISIS CEO, offers. "It has added strength to both GPS and ISIS, since we are in the same industry doing what we know best. A more fundamental reason for this acquisition was that our personal and business values mesh so well. Our goal is to return GPS to being a great supplier of audio equipment to the broadcast industry."

About Graham-Patten Systems products
The D/ESAM Series of Digital Edit Suite Audio Mixers is comprised of three models, all of which feature a programmable architecture, full edit system control over all mixer functions, and the ability to handle both analog and digital inputs. These Emmy® award-winning mixers provide editors with unparalleled control over audio in the video edit suite.

The D/ESAM 8000 eight-bus audio mixer features extensive surround sound mixing and monitoring capabilities. The same Emmy® award-winning innovation and attention to detail that made the Graham-Patten D/ESAM 820, 400 and 230 an industry-accepted standard formed the foundation for the D/ESAM 8000. The D/ESAM 8000 employs the Klotz VADIS mixing engine and routing system; VADIS is time-proven and on the air 24/7in hundreds of the world's largest broadcast stations and networks. The 8000 has many features that will help broadcasters and post facilities make the transition to new multichannel/surround sound capabilities supported by DVD, DTV, and other digital delivery formats - important features that make it unique in its class.
The D/ESAM 400 is a mid-range digital audio mixer that supports up to four eight-channel analog/ eight-channel digital, or 16-channel digital input modules. The mixer is ideal for mid-sized edit suites and can be economically reconfigured as operating requirements change. The D/ESAM 400 mixes 16 channels to four outputs. Output buses provide four digital and four analog output channels for recording, along with four independent monitor channels. Available with a table top console or rack mounting control panel, the D/ESAM 400 is easily configurable, with room for expansion.
GPS' most cost-effective digital mixer, the D/ESAM 230 offers powerful performance in a sleek and compact design that integrates a control console and electronics chassis in a single table-top unit. Standard features include send outputs, monitor sub-mixer, fader range, user configuration registers, and D/MEM write protection. Outstanding features include analog and digital input architecture; logical device assignments that make modifications to the edit system's sources and outputs convenient; familiar user interface - audio signals are mixed and edited in the same way that video is edited; expandable architecture, with eight AES/EBU digital inputs as standard, with additional space for two plug-in modules, each providing eight additional inputs; and D/MEM register storage and recall of up to 40 setups that can be saved in nonvolatile memory and recalled with the push of a button.

SoundPals Building Blocks The SoundPals™ product line is a family of self-contained building blocks for digital audio format conversion, signal processing, distribution, and test. Rugged and compact, the units are ideal for field or studio applications. ADC-24 Two channel 24-bit A/D converter DAC-24 Two channel 24-bit D/A converter DMIC-24 Two channel 24-bit mic preamp DA-14 Four output AES distribution amplifier DTG-1 Digital test generator VRG-1 Video-referenced AES/word clock generator ADAT-1 Eight channel analog to ADAT converter ADAT-2 Eight channel ADAT to analog converter ADAT-3 Eight channel AES to ADAT converter ADAT-4 Eight channel ADAT to AES converter DFADE-2 Two channel digital fader DMIX-41 Four channel digital combiner

Compact size: 5.2"W x 1.62"H x 6.625"D Scratch resistant powder coat paint Powered from any 6VDC source, including batteries Rack mountable using the optional tray

Company Milestones

• 1999 - Development begins on the fourth member of the D/ESAM mixer family, the eight-bus, surround sound-capable D/ESAM 8000. The company joins forces with Ensemble Designs to develop the Avenue Signal Integration System, a range of modular products for digital video and audio signal processing, distribution, and synchronization.
• 1998 - Six new modules are added to the SoundPals product line: four ADAT-format interfaces, a digital test generator, and a video-referenced AES-format word clock generator. The D/ESAM 230 is further enhanced by expanding the mixer's maximum input capability from 16 to 24.
• 1997 - The D/ESAM 230, a feature-enhanced version of the D/ESAM 200, is introduced at the NAB Convention. The product receives an "Editor's Pick of Show" award from Television Broadcast. The SoundPals product line, a family of self-contained modules for digital audio signal conversion, processing, and distribution, is introduced at NAB. The product line receives an "Editor's Choice" award from Videography and an "NAB Pick Hit" award from Broadcast Engineering.
• 1996 - The D/ESAM 200, the most compact, lowest priced D/ESAM mixer to date, is introduced at the NAB Convention. It is recognized with an "Editor's Pick of Show" award from Television Broadcast and an "NAB Pick Hit" award from Broadcast Engineering.
• The D/ESAM IV protocol is released. The company supplies a total of more than 50 D/ESAM mixers to Panasonic for use in the International Broadcast Center at the Summer Games in Atlanta.
• 1994 - The D/ESAM 820, an enhanced version of the D/ESAM 800 is introduced.
• 1992 - Introduction of the second mixer in the D/ESAM family, the mid-sized, mid-priced D/ESAM 400.
• GPS supplies a total of more than 25 D/ESAM mixers to NBC for use in their coverage of the Summer Games in Barcelona.
• 1991 - GPS receives an Emmy® Award for outstanding engineering achievement for the development of the D/ESAM 800.
• 1989 - D/ESAM 800 Digital Edit Suite Audio Mixer is introduced. Not only is it the first digital audio mixer designed specifically for video editing, it is one of the first digital audio mixers of any type.
• 1987 - VAMP, a unique modulation scheme that combines multiple, high quality, digital audio channels with a video signal, is introduced.
• 1984 - Original Model 612 Edit Suite Audio Mixer (ESAM) is introduced. A breakthrough product, the 612 is the first audio mixer in the world to provide full edit system control of audio source selection, preview, and transitions in a manner similar to that of a video switcher. GPS publishes the ESAM Control Protocol, which subsequently becomes the industry standard protocol for the control of audio mixers. ABC purchases a number of Model 612 mixers for use in their coverage of the Summer Games in Sarajevo.
• 1983 - Bill Rorden, former VP of Engineering at the Grass Valley Group, joins the company as the fourth principal.
• 1982 - The 9400 Series, a range of distribution amplifiers designed as replacement modules for Grass Valley Group 900 Series modules, is introduced. The 1200 Series, a range of remotely controlled video and audio DA's is introduced.
• 1981 - GPS is awarded several important custom engineering and manufacturing contracts by ABC-TV.
• 1980 - Graham-Patten Systems, Inc. is founded by Merv Graham, Mike Patten and Jim Ward, former engineers and executives at the Grass Valley Group

Founded in 1980, Graham-Patten has established a reputation as the world's leading developer of high performance digital audio products for the professional video industry. The company is best known for its Emmy®-award winning D/ESAM digital edit suite audio mixers. Throughout the video industry, Graham-Patten is recognized for its technical innovation, product reliability and outstanding customer support.