DOD DFX7 Digital Stereo Flanger

One of only two appearances of the DFX7 Digital Stereo Flanger was an illustration inside the DFX5's instruction manual

Editor's note: The illustration above is a cleaned up version of the original photo provided by Joseph Daoust. Thanks Joseph! =)

The DFX7 Digital Stereo Flanger was conceived as part of DOD's DFX series, but was never produced or even advertised. Likely based on the flanger circuit in the DigiTech PDS 1700 Digital Stereo Chorus/Flanger, it is unclear why the DFX7 never made it out of the gate. Even if DOD's digital stereo flanger's circuit was technically feasible in a compact pedal size, it may have been too expensive to produce. In addition, if its flanging effect was as mild as that of the PDS 1700, it might have been difficult to sell. Ibanez had apparently offered a digital chorus and a digital flanger as part of their "Master"/"L" and "10" series of pedals in the late 1980s, but they were discontinued by 1990 (which may explain why the DFX7 was never produced). To the best of our knowledge, no other company attempted to produce a digital flanger as a compact pedal until Boss released the BF-3 Flanger in 2002. (Why the DFX7 was never produced has been solved along with many more revealing facts. See Updates & Insights section below)

• Controls: unknown, but probably the same as the flanger half of the PDS 1700 (Speed, Delay Time [1-12.8ms], Depth, Regen)



• External link: DOD DFX7 Stereo Flanger on Effects Database



• External links (for the DigiTech PDS 1700):


• DigiTech PDS 1700 on Effects Database


• DigiTech PDS 1700 on Noise Guide




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AI render of the 2 mockups made of the DFX7 Digital Stereo Flanger.
Here are some thoughts on what might have been...


DOD DFX7 Digital Stereo Flanger
The Pedal That Came Within Millimeters of Existing
by Ron Henley

The DOD DFX7 Digital Stereo Flanger holds one of the most fascinating stories in the entire DOD FX-series. For decades it was believed that the pedal never physically existed and that its only trace was a small illustration printed inside the DFX5 Digital Stereo Chorus instruction manual. But recent conversations I had with Roger Johnsen, the VP of Engineering at DigiTech and the creator of the DFX pedal line, have revealed a much deeper, and far more exciting truth.

First, the DFX7 did exist, kind of. Roger confirmed that only two full mockups of the pedal were ever built and hand-carried to and from the NAMM Show by Roger himself. These “dummies” were loaded with FX57 Hard Rock Distortion boards. From Roger's memory, the pedals featured a darker brown metallic finish with light gray graphics, reminiscent of the gray graphics color scheme used on the FX15 Swell Pedal. According to Roger, an actual photograph of one of these mockups appeared in a DOD catalog from around 1989. That catalog image, if it can be located, is likely the only real photo of the DFX7 in existence. (If you have that catalog, please contact me immediately!)

As for the mockups, one never made it back to Roger's desk from the NAMM show. Roger kept the other one in his possession until sometime around 2013, when he sold it on a local Utah buy-and-sell website (ksl.com) to one very lucky fan. Both of the pedal's current whereabouts are unknown, making them two of the rarest pieces of DOD history, along with the DFX6 mockups, ever produced.

Earlier assumptions suggested the DFX7 might have been based on the flanger circuit inside the DigiTech PDS 1700 Digital Stereo Chorus/Flanger. Roger has now clarified this point directly: "The DFX7 was not based on a previous product. It was based on using our new custom HDC (Happenin' Delay Chip) ASIC."

So why wasn't the DFX7 released? The reason is surprisingly simple. At the time, DOD was still using through-hole components, and the existing 1/4-watt resistors, standard DOD parts, plus all of the other large through-hole components collectively were too large to physically fit the circuit into the enclosure. Roger explains: "I simply couldn't make all the parts fit for either the DFX6 or DFX7, so we just moved on to other higher priority projects."

With this new information, the DFX7 transforms from a mysterious "paper-only" pedal into something much more compelling: a fully designed, fully intended product that advanced to the point of a physical mockup, catalog photography, and inclusion in printed materials, but ultimately remained unreleased due to engineering constraints.

In that sense, the DFX7 cannot simply be considered vaporware. It is one of the rarest types of pedals in existence: a documented, photographed, and near-completed design that slipped away only at the very end of development. Not really a "lost" pedal, it's more of a documented intention.

A Digital Flanger That Arrived Too Early

If the DFX7 had reached production, it would have been one of the very first compact digital flanger pedals ever made. Most flangers of this era, DOD's own FX70C and FX75, as well as offerings from Boss and Arion, were all analog BBD-based designs. Although Ibanez released the very first Digital Flanger (DFL) in 1985, Digital modulation pedals didn't truly become practical until much later, with Boss not releasing the BF-3 Digital Flanger until 2002. In hindsight, DOD was attempting something the hardware of the time wasn't quite ready for. This visionary creativity is one of the many reasons I am such a huge fan of DOD =)

Evidence of a Larger Digital Plan

The DFX7 also hints at a broader digital strategy inside DOD during the late 1980s. Its model number fits logically within the DFX series, implying that DOD envisioned a family of digital stereo effects, not isolated experiments. A Digital Stereo Flanger would have represented a significant step forward in processing complexity at the time, especially in a compact stompbox format.

That ambition alone helps explain why the DFX7 progressed far enough to have a mockup created and appear in printed documentation.

When the Media Came Before the Pedal

The DFX7 represents a rare reversal of the usual product lifecycle. Typically, pedals appear first as hardware, then in advertising, and finally in manuals. Here, the media came first. The illustration in the DFX5 manual, the mockup, and the photo of that mockup in a 1989 DOD catalog. The pedal never followed.

That makes the DFX7 a snapshot of a moment in time: a product that was planned, named, illustrated, mocked up, and positioned... but never manufactured.

A Ghost of the DFX Line

Viewed today, the DFX7 feels like a missing link between DOD's analog heritage and its digital ambitions. Its absence leaves a visible gap in the DFX lineup. One that can literally be seen when the illustration is placed alongside released models.

The DFX7 matters not for what it did, but for what it almost represented.

It remains one of the most intriguing "what-ifs" in DOD pedal history. A pedal that lived just long enough to be printed, even mocked up, then quietly disappeared.



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