About Graham-Patten


Company Information

Sustaining Member


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.

In October 2004, Graham-Patten was aquired by The ISIS Group which manufactures high-performance video, audio, and signal management and processing solutions for the television, post-production, and multimedia industries worldwide. Both companies are known for technical innovation, product reliability, and outstanding customer support. Information about ISIS Group is available here .

Meet the Founders of The ISIS Group

Leonard A. Dole


Len Dole


"I want ISIS to be recognized as a world class contributor of solutions and technology to the Broadcast and Multimedia industries. My goal is for us to remain a people-oriented, well-managed company drawing respect from all of the markets and customers we serve. I believe this will happen as long as we focus on ensuring that the customer experience with ISIS, from initial inquiry through personal follow-up after delivery of a product, is excellent -- to the point that customers will want to come back to ISIS."

Read the full interview with Len...


Industry Background: Over forty years of television industry experience, with nineteen years at GVG specializing in International sales/marketing and General Division Management at the Vice Presidential level.
Education: Bachelor of Science in Electrical Engineering, Radio and TV Engineering from Blackburn Polytechnic College in the United Kingdom.

Steven R. Block


Steve Block

"What motivates me is to end the day knowing that I've met my obligations to everyone I come into contact with. That's what makes a great day. ISIS is effective when our customers trust our equipment and all of our employees, because they know that we are 100% committed to their success. I believe that as long as our customers and employees are our complete focus and we treat them right, we will succeed."

Read the full interview with Steve ...


Industry Background: Over thirty years experience in financial management in high tech industries; eleven years at GVG. Experience ranging from cost accounting to complex mergers and acquisition as CFO.
Education: Bachelor of Science, Business Administration (accounting) at San Jose State University.

Robert Stillwaugh



"I'm pleased that ISIS is growing, but I sincerely hope - and work to make sure - that we all never lose sight of the "small company that can do" approach. There is nothing like the feeling of accomplishment upon completion of a project to the satisfaction of the customer and myself. I enjoy being able to find a solution to a problem that the customer didn't think could be solved - bringing extra value to the relationship."



Industry Background: Twenty-four years at Grass Valley Group, specializing in engineering development / systems engineering; managed custom products group. Extensive experience in television station operations, project design and implementation.
Education: University of Cincinnati, Bachelor of Arts degree in Radio-Television Broadcasting.

Recent Milestones



  • TV Technology STAR A 2008The Sonarae audio monitor from Graham-Patten was chosen for the TV Technology STAR Award (Superior Technology Award Recipient) at IBC2008. Of the hundreds of products displayed, only twenty-five were chosen for this honor.

  • Pick Hit awardGraham-Patten's Sonarae garners NAB2008 Pick Hit Award. Out of the hundreds of new products introduced at NAB2008, just 40 were selected by a panel of industry professionals for the Broadcast Engineering Pick Hit Award. The new audio monitor system for non-linear edit suites from Graham-Patten, Sonarae, is in that select group.
  • Graham-Patten Unveils Sonarae, a unique audio monitoring system designed for NLE operators who, as a part of the NLE process, critically monitor the audio associated with a video edit session. Sonarae offers an input mode selector for up to eight AES/EBU data streams or 16 individual audio channels, which allows the user to switch from the main AES/EBU inputs to STEM recorder preview inputs or to an external tone generator.  A set-up, learn, and clear function, along with 5.1, 6.1, and 7.1 surround sound stereo mix-down selectors, allows the operator to store custom stereo mix-down formats that are available for recall at any time.


  • Three Graham-Patten D/ESAM 8000 Digital Edit Suite Audio Mixers are now part of the HD operation at the ABC-TV headquarters in New York City, used with the Editware editing control system and a Ross Synergy production switcher. ABC-TV required a custom interface to allow the mixers to meet the needs of on-air usage. The interface allows the Ross Synergy to control the D/ESAM 8000s in the on-air environment.
  • Graham-Patten Systems adds two new SoundPals audio de-embedders. The ASDM-4 and ASDM-8 auto-sensing de-embedders which offer a versatile way to ingest the various TV standards and de-embed up to eight channels of analog or four AES pairs of audio. The new units auto-sense the video format (HD-SDI or SD-SDI) applied to the looping input. A headphone output lets the user select and monitor stereo channels from any group.


  • AEDM-4/HD and AEDM-4/SD SoundPals de-embedders are introduced. These new SoundPals take in HD or SDI video with embedded audio and de-embed up to 8x AES/EBU outputs. Each unit has headphone outputs enabling the user to select and monitor stereo channels from any of the AES/EBU groups. The new SoundPals units complement the now highly regarded HDDM-8 and SDDM-8 HD and SDI analog audio de-embedders released in 2005.
  • Graham-Patten Systems introduces the ADLY-4 AES Audio Delay unit to the SoundPals line, providing an easy-to-use and cost-effective solution for systems timing problems where audio to video synchronization is essential.


  • New advances to the D/ESAM Series Digital Edit Suite Audio Mixers, including the new D/ESAM 8000 are showcased at NAB 2005.
  • Interest in the D/ESAM Series of innovative Digital Edit Suite Audio Mixer is significantly renewed with growing sales worlwide.
  • Imagica, one of Japan's largest post-production houses, adds a D/ESAM 8000 Digital Edit Suite Audio Mixer. Totsu International served as systems integrator.
  • A high definition de-embedder is added to the SoundPals line of audio solutions. The HDDM-8 provides eight channels of analog audio output in a compact package.
  • The SDDM-8 Audio SDI de-embedder is introduced. This addition to the popular SoundPals line of audio building blocks provides a versatile way to ingest the various SDI-TV standards and de-embed the eight analog channels of audio.


  • October, 2004 - The ISIS Group, a manufacturer of professional video and audio equipment, acquires Graham-Patten Systems from Klotz Digital America. Graham-Patten Systems will focus on the next generation of audio mixing, conversion and distribution products targeted to meet current and future market needs.



Graham-Patten is located at 119 East McKnight Way, Grass Valley, CA. We are in the heart of gold country where, in the 1890's, Grass Valley had 56 gold mines in operation. Just below the surface, a labyrinth of tunnels totaling 367 miles honeycomb the earth. The Empire mine, one of the largest, yielded a total of 5.8 million ounces of gold during its lifetime.

These days, the "gold" that is mined in Grass Valley is technology. Graham-Patten is just one of many high-tech companies that have found a home in this beautiful setting. The attraction is the fresh air, sunshine and friendly people. For more information about this rich area, see the Nevada County Online Magazine or the Nevada County Business Directory.


Graham-Patten Systems, Inc.
(530) 477-2984
Email:Graham Patten

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