David Gilmour used the Digitech IPS-33B Super Harmony Machine during his 2006 tour, as confirmed by Bjorn on Gilmourish.

"These things were called super harmony machines and they actually have this one program in here- they actually have two programs that I really like. One was sort of like a self-tuning feature that I used on the song, "Down, Down, Down" many years ago. But the other thing that's really cool is that it provides this very interesting E minor chord harmony that we use on the melodies for the song "Why.""

You can see on this photo Digitech IPS-33B Super Harmony Machine in Marty's rack.

Listed among Collins' gear in the May 1991 Musician interview "Bootsy Collins Effects the Funk" by Gene Santoro.

MUFFS 'N' MUTES

BOOTSY'S RIG is far from simple. "On the pedalboard I've got all the old stuff: three Mutrons, one Big Muff, a Yamaha distortion, an old rackmount digital MXR, the small Boss DD-3. I've got a few new Digi-Techs for rackmount: the Time Machine 4000, the Smartshift Bass Harmonizer, a stereo Rat, an FX-500B. I'm using Roland Space Echo — of course. I've only got two Electro-Harmonix Bass-micro synths left, and I can't find no more. At least I've got a million Mutrons and Big Muffs!

"My amps are the QSC 4000: They run my two sets of subwoofers, which are four 18"s in each cabinet. On the mids I've got four cabinets, each with two 15"s, two 12"s and a horn; the highs are four 12"s and a horn. All my speakers are Celestions. The amps running the mids and highs are two Yamaha 2000As and one QSC 4000. I'm still going with three old Alembic preamps, which gives me that warm, clean sound; they're running my highs, mids and lows. I use that for the Bootsy Rubber Band; for Deee-Lite I lighten up. Oh yeah — always the Space Bass. But I'm starting to get into five- and six-string basses, and even fretless, since I've been working with Bill Laswell."

"Everybody thought I had tons of gear but all I had was a Digitech IPS33B, a smartshift effect that would take two expression pedals. It was before they made the Whammy pedal and the Space Station— all that same stuff was in that rack unit. If you think of that device as an apartment building, I knew what was in every single room, behind each couch. I was doing Whammy pedal stuff before you could get the Whammy pedal."

On his website Doug Wimbish lists his gear including this.

"It's used in the clean of the Diezel. I use it as a bit of detune and that's it," says Barry Stock, about his Digitech 33B, at 2:56 in this rig rundown video.

As cited in the gear list of this May '92 feature in Music Tech magazine

In a 1994 photo from Guitar Shop, David Torn is shown with the Digitech IPS-33B Super Harmony Machine, highlighting his setup.

"This is the work in progress picture. I'll take a finished picture on my next gig. I have to use 2 effects processors, which I'm not too happy about. The G-Force is fantastic, but I couldn't get it to absolutely everything I needed. I'm still using the Digitech IPS-33B for the complex harmonies."

On October 29, 2018, Equipboard released an article featuring German guitarist Julian Wolf. In this article, Wolf mentioned that he uses the Digitech IPS-33B Super Harmony Machine as part of his rack effects system.