“The The live amplification is a racked set up based around two Boogie Quad preamps, a Boogie 295 poweramp, and a tc 2290. The tc's effects loop takes in a Yamaha GEP50, Roland GP8 and Korg A3 guitar processors, an Eventide H300 Harmoniser and a tc spatial expander. Speakers are two Marshall 2x12" cabs loaded with EVs, and the whole set-up is doubled for live work in case of breakdowns.”

In this article, Music Radar interviews Edge's guitar tech Dallas Schoo and details his touring rig for 2009's "360° Tour." It lists the Korg A3 among his effects.

In this article in the December 1995 issue of Future Music magazine, the A3 is named in the "Kit List" as being one of Eno's effects.

The Korg A3 can be seen in Neil Halstead's guitar rig.

"Eventually I switched from the Echoplex to a Lexicon PCM 42, but these days I use a Korg A3—it’s my favorite effects unit. In fact, I’ve got five of them."

"I use the Korg A2 and Korg A3 multiple effects units on almost everything - for livening up synths, for general raunch and increasingly as my main guitar/bass pre-amp. I've decided that these Korgs have the world's best (or at least: most useful) distortion. I've tried loads of guitar pre-amps (I've got a Marshall JMP-1, a Rocktron mAXE and an ART SGX2000 which isn't bad), but the Korgs take the biscuit. Of course, they don't make 'em any more. The A2 and the A3 are more or less the same. The A3 has a direct out which is handy; the A2 has a stereo input and a few more algorithms. Both units are attached to the Doktor when it's his turn to play the bass."

The Korg A3 is spotted at :19s into this YouTube video. It's part of John's rack case with a Marshall JMP-1 preamp.

Sisters of Mercy gear list, circa 1991:

Tim Bricheno Squire Strat, 2x Squire Tele, Gibson 'Chet Atkins', 2xJC120, 2x4x12 Marshall cabs, 1x50w Marshall amp, Ibanez Tube Screamer, 2xBoss DD-3, Boss MZ-2

Andreas Bruhn 2xKramer Focus 1000 (with DiMarzio PAFs), Mesa Boogie Strategy 400, Mesa Boogie Quad pre-amp, 2xMarshall stero cabs, Quadraverb FX, Rat distortion, Morley wah-wah, Boss CS-3

Tony James WAL Custom bass, WAL MIDI Custom bass, 2xAMPEG SVT amps, 2xAMPEG 8x10 cabs, Korg A3FX

Sequencing Compac 386 portable PC, running Voyetra software, 2xAkai S1000, with external hard drives

In the January 1990 issue of "Keyboard Magazine," the right-side column on page 37 mentions that Alan Pasqua used a Korg A3 multi-effects unit rack as part of his rig with the band Giant. The article was authored by Alan di Perna.