When initially working together, a period that included the production of songs such as “Ocean Eyes,” “Six Feet Under” and “Bellyache,” O’Connell used an Audio-Technica AT2020 cardioid condenser mic on his sister’s vocals. More recently, he has been using a Neumann TLM 103 large diaphragm mic. “...

Finneas recording Billie Ellish with a Neumann TLM 103 on the first clip of this video.

Finneas says how he has upgraded from the TLM-103 to a more expensive a higher quality Chandler Limited REDD Microphone.

All of the sounds on 'Ocean Eyes' were Logic stock sounds, which I tweaked a bit with EQ and layered. Now I have quite a few plug-ins, but honestly, I still feel like being very minimalist in my approach. The three plug-ins for sounds that I used the most on Billie's album are Spectr...

In the video at 4:37, FINNEAS is seen praising this headphone's use as a 'primary source of reference mixing headphones'.

"This is no humblebrag bedroom studio that turns out to have been professionally outfitted. It’s just a regular bedroom, with a bed against one wall, where Eilish sat to record her vocals, facing a desk and bookshelves and O’Connell’s modest production setup: Apple Logic Pro X, a Universal Audio ...

For Eilish’s productions, he has always used virtual instruments, such as Keyscape by Spectrasonics. “It’s amazing, especially the Dark Indie upright pianos. My piano in my parents’ room is not situated well for recording. It’s more fun to write on it, then record on a MIDI keyboard, especially b...

At 33:18 , During his interview on Pensado's place, he mentions he uses Little Alterboy, among many other plugins, in his productions.

Below the Furman M-8Dx Power Conditioner and above the Apollo 8 Interface, you can see that FINNEAS uses a Focusrite Scarlett 18i20 in his rack systems.

In the above video you can clearly see FL Studio's icon (which is the 8th app. from the left side in the bottom panel) in the monitor which is connected to FINNEAS' laptop.

0:19 you can see that he has MXR M80 Bass preamp as he is the bass player in Billie Eilish band.

He bought it in Summer of 2019 in the Guitar Center in front of Berkley College of Music in Boston Guitar made for a collaboration between Disney's Coco and Córdoba guitars.

At 0:19 you can see, by design, the OP-1 in a plastic case sitting on a desk.

Finneas appears to be playing a Wurlitzer 200A Electric Piano because of the music rack, alluminium faceplate and the written part on it.

All of the sounds on 'Ocean Eyes' were Logic stock sounds, which I tweaked a bit with EQ and layered. Now I have quite a few plug-ins, but honestly, I still feel like being very minimalist in my approach. The three plug-ins for sounds that I used the most on Billie's album are Spectr...

The sequential Circuits Prophet XL can be visible in the background around the 00:20 timestamp in the finneas producing therefore i am: Mixing with the masters video

During This Video You can see that Finneas has the Komplete Kontrol S88 set up to the left of his computer set up.

He used it again for Lollapalooza 2019 in Berlin, where I saw it again. He uses it as „bass shaker“ during live on stage, for better feel.

While Finneas' and Eilish's music became more and more minimalist over time, Finneas' studio setup was minimalist from day one. "I moved to my own house early this year, and now work from a room there, but my setup is still pretty much the same as when we did 'Ocean Eyes'. I still us...

In this Tweet, Finneas says he uses 808 Studio II by Initial Audio on almost all his productions.

In the youtube video at 3:21, Finneas mentioned that he used the Sketch Cassette plugin for his voice.

At around 16:05, Finneas says that his rack for live shows includes a Nord Stage 3. It is unclear whether or not he uses the 88 or 76 key version. At 16:13, he says that it's "always [on] a grand piano because it's just got such good hammer action," which is great, since Billie's songs usually in...

In Claudia Sulewski’s (Finneas’ girlfriend) recent vlog she showed all of the gear they took from Finneas studio and in this picture, a Vox AC30 can be visible in the bottom along with other gear

In this Tweet, Finneas says he uses the Fab Filter Twin on almost all his productions.

He uses MacBook Pro for production with Billie Eilish.

In this YouTube video you can see FINNEAS is singing the sE Electronics V7. He uses this microphones on every live concert. He and his sister Billie also artists of sE Electronics. So this microphone loves their FOH engineer too.

In the mid-left and mid-right of this picture posted on Finneas Instagram, you can see the SM7Bs mounted on mic-stands.

At minute 2:39 we can see how he uses the Roli Seaboard RISE 25 to compose a Billie Eillish song

At 0:45 Finneas mentions his use of Logic Pro X

"Plug-ins play a large role in O’Connell’s production process, which is to be expected. He is partial to a few: Spectrasonics Omnisphere, Trilian, Keyscape, AIR Music Hybrid 3 and Loom, Output Substance for bass, and Analog Strings make their way onto every song."