A second rack is filled with effects units. These are topped by a record deck ("my biggest effects unit"), below which are two Korg SRV3000s, a Yamaha Rev 7, an SPX90, Lexicon PCM70 ("I really love that, especially for vocals), BSS compressor, Digitech Smartshift, and Drawmer gates. Not a huge selection "but I use the Synclavier for effects. Its voice structure is a little like that [pointing to the D110] in that it has partials; if I want a delay I can take a sound, set different delays for each parts — put some attack on, say, the third delay, make it so that the original sound comes in last, and fade in each delay like a backwards echo. Sometimes it does sound a bit too clean though."

Prince Charles Alexander confirmed that Mary J. Blige used the Yamaha SPX90 Digital Multi Effects Processor on her album, stating, "We were renting gear as well. The Lexicon 480L was the main reverb unit we were using. For delays, we were using the PCM 42. I had a multi delay unit called the SPX 90. We used an LA-2A to compress the vocals. We used 1176s to compress the basses." This information is corroborated by the article "Key Tracks: Mary J. Blige’s My Life" on the Red Bull Music Academy website.

According to Dave Amato in this video at (11:20), he uses Yamaha SPX90 digital effects processors in his live rig. "I know they're old," he said, "but I just love the way they sound."

Accordint to the Premier Guitar article here

"With a Bob Bradshaw-designed rig, Amato is able to cover a lot of ground. In the rack for his main rig he has a Yamaha SPX90 Delay, Roland SRV-2000 reverb, Eventide Ultra Harmonizer, DBX 160A compressor, TC Electronic 2290 delay, TC Electronic 1210 Spatial Expander+Chorus/Flanger, and a Lexicon PCM70. The upper rack houses his "B" rig, which contains a Dunlop Tremolo, Korg ToneWorks G4 Rotary Speaker Simulator, Dunlop Uni-Vibe, MXR Noise Gate, Boss DSD-2 Digital Sampler/Delay, Boss DD-3 Digital Delay, Boss RV-3 Digital Reverb/Delay, Boss PS-3 Pitch Shifter, and a Line 6 MM-4."

In this video, Sergey Golovin mentions in the description that he used a Yamaha SPX90 rack effects processor.

Robert uses a Yamaha SPX90 effects processor, according to this Guitar Geek rig diagram.

In the Sound on Sound article "Chris & Cosey: 2 Unlimited," Chris & Cosey discuss their use of the Yamaha SPX90 Digital Multi Effects Processor, mentioning it as a key piece in their effects processor lineup.

Jools Holland's equipment list, from the January 1993 issue of Music Technology:

(Helicon Mountain studios)

Instruments: Casio FZ1 Keyboard Sampler Casio FZ10M Sampler Module w/80-disk sound library Casio VZ1 Synth Hohner Clavinet Korg CX3 Organ w/Leslie 145 Cabinet Yamaha C5 Grand Piano Yamaha DX7 Synth

Recording: Atari 1040ST w/Steinberg Pro24 and C-Lab Creator sequencing software Fisher CD Player Revox PR99 two-track Saturn 824 24-track (Dolby SR on arrangement) Soundtracs Quartz 48-channel in-line desk (96 inputs on mixdown) Casio DA1 DAT Recorder Casio DA2 DAT Recorder XRI XR300 SMPTE Synchroniser

Effects: Drawmer Gate Drawmer Dual Compressor/Limiter Eventide Harmonizer Lexicon 480L Reverb Lexicon PCM70 Multi-effects Processor Roland SDE2000 Digital Delay SA PPE 240 Teac Graphic Equaliser Yamaha REV7 Reverb Yamaha R1000 Reverb Yamaha SPX90 (x2) Multi-effects Processor

Microphones: Neumann U87, AKG, Shure, PZM

"The monitors are Yamaha NS 1000s - they've got a big, beautiful sound. Then there's the 16-track Fostex, the Atari C-Lab, the patch panel... Here's a fantastic Eventide H3000 harmonizer. This is a thing I made called a VEWA - a vocal effects waveform animator. It adds vocal-like formants to a signal. It's sort of like a random vocoder. I used it quite a bit on Hybrid. This here is a Lexicon LXP1 digital reverb, which has an incredible quality to it. The Yamaha TX802 is the synthesizer I use. This Bel digital delay line I use live a lot. It produces 13-second loops in sync with MIDI, so it's like having a rhythm guitarist who can play for 13 seconds - that's very important for my live work. Here's the Yamaha SPX90 and Roland reverb I use sometimes."

In the YouTube video titled "STUDIO TOUR 2025 | GUITARS, AMPS, CABINETS & GEAR IN GENERAL," Euge Valovirta, a guitarist and music producer, showcases his studio setup, where the Yamaha SPX90 rack unit is visibly featured at the 8:00 minute mark.

in this image you can see one of Nico's yamaha spx90 rackmount units in the bottom right below the rane mixer.

8:18 into the video, we clearly see the item.

Included in list of Stuart Kershaw's equipment published in a 1993 issue of Future Music.