Used on Grohl's vocals for "The Pretender", as stated by mix engineer Rich Costey in this March 2008 Sound on Sound interview. An image of the item can be found here.

Vocals: Mercury EQH, UA 175, Roger Mayer RM58, Waves DeEsser, Digidesign Reel Tape Saturation, Sound Toys Echoboy, Pultec EQP1A, SPL De-esser, Neve Portico 5042

"If I recall correctly, the lead vocal is doubled throughout the song. I used a Waves DeEsser plug-in on it, which I'm quite a fan of, as I've not heard a hardware de-esser that is competitive with it. The main signal chain after that was a Mercury EQH tube EQ and then a couple of vintage UA 175s. I hit the background vocals with the Roger Mayer RM58. I haven't mentioned any plug-ins yet, apart from the Waves DeEsser, because I hardly used them on 'The Pretender.' The only other ones I used were the Reel Tape Saturation and the Pultec EQP1A on the intro vocals, and the Sound Toys Echoboy on one of the end vocal overdubs.

"I used board EQ on all the vocals. The Pultec EQP1A plug-in on the intro vocals was to help them cut through. The Reel Tape Saturation was a plug-in that I had just bought. I wanted to warm the vocals up a little bit with it and make them a little bit crisper. Nothing too distorted. The Echoboy plug-in was used on a vocal overdub at the end for a tight delay. I don't tend to use plug-ins that much; they're really not that interesting, in my opinion. Finally, I also used an SPL De-esser on some vocals, and the Neve Designs Portico 5042 for a bit of crispness. It has its own sound, and I used it a lot on the whole Foo Fighters album.

"To complete the picture, I used an EMT plate and the room mics for general reverb, and my two EAR 660 limiters were my bus compressors, together with the Manley Massive Passive. We printed the mix to the ATR102, on half-inch analogue tape, from which it was mastered."

Two of these can be seen as part of the rack-mountable equipment in the studio in this video.