At 1:23:19, he uses this plugin

Used on Lamar's vocals for "All the Stars" as stated by producer Matt Schaeffer in this May 2018 Sound on Sound interview.

Kendrick Lamar’s vocal audio tracks, named after his teenage stage name K.Dot, consist of his first verse rap track, ‘VS 1 LD’, and 10 tracks for three moments in the track where he sings the pre-hook in a robotic voice. The verse rap track only has the AIR Flanger on it, and is sent to the ‘Dot VS LD’ aux track, which has eight inserts and five sends. Nine of the 10 pre-hook tracks have Auto?Tune, while the top four have a number of plug-ins on the inserts, including the EQ3 seven-band, Waves RVox, UAD Galaxy Tape Echo, SoundToys Little AlterBoy, SoundToys MicroShift and Valhalla Vintage Verb. These four are sent to a ‘Hook Ref’ aux track higher up in the session with another four plug-ins on the inserts and five sends. The other six are backing vocals to the four other pre-hook tracks and have no other plug-ins, other than a Trim, and are sent to a ‘Hook Background’ aux, just below them, which itself also is sent to the ‘Hoof Ref’ track. It’s a pretty complicated vocal signal chain, as Schaeffer admits.

“The ‘Dot VS LD’ aux indeed has a lot of stuff on it! I did most of the processing on that bus. On the inserts there are the SSL E-Channel, Waves RComp, Waves Q10 EQ, Waves DeEsser, UAD LA2A, UAD Pultec EQP1A, SoundToys Decapitator and Pro?Q2. The SSL channel strip, Q10 and RCompressor remain from the tracking, and maybe the DeEsser as well, but I most likely messed with the settings more during mixing. The Q10 has a high-pass at 50Hz and I notched out a frequency that was bothering me around 8.5kHz with the Q2. I added the other plug-ins during mixing, and they all add something a bit different. I’m boosting 100Hz and 16kHz with the EQP1A. As I said, I like using several EQs on one thing.

“The sends go to a ‘FlangeVerb’ track, on which I put the RVerb and the UAD MXR Flanger, then the ‘Huge Verb’ with the [Audio Ease] Altiverb and EQ3, ‘Hook Valhalla’ with the Vintage Verb, and the SoundToys EchoBoy, the ‘EMT250’ aux with the UAD EMT250, Valhalla Plate and MicroShift, and then finally a send to the ‘Dot VS Delay’ track, with the EchoBoy, set to quarter note, the Reel Tape Flanger and the RCompressor. The EchoBoy is the main delay you can hear in the verse. The EMT250 is not set to a reverb, but to a phaser effect, which gives a cool stereo effect. The Valhalla adds a bit of reverb here, though it’s set to -12, so it only gives a tiny bit of ambience, and the MicroShift makes the whole thing a little wider. It probably still sounded a bit dry, which is why I sent the track to the ‘Huge Verb’ aux with the Altiverb, again taking out low end with the EQ3.

Can be seen at 1:01 in this video

(@23:22) "so I'm really driving that with this API channel strip as well as putting it through the Galaxy Tape Echo"

Used for the vocal tracks on "Beggin", as described by as described by Alessandro Marcantoni in this October 2021 Sound on Sound interview.

“All vocal tracks have the same inserts: Avid EQ3 7‑band, UAD 1176 LN, Mäag EQ4, and again the 7‑band. The main difference is in the plug‑in settings and in the sends. The a cappella at the beginning of the song is sent to the Very Large Hall aux with the Avid ReVibe II, as well as the Hall aux with the UAD Precision Delay Mod, and the V Hall which has another instance of the Lexicon 224. I wanted the a cappella to sound larger than the other vocals, which have only the 224 and a send to the V Slap aux, with a delay from the UAD Galaxy Tape Echo.

“The main vocal tracks also have a send to the V Amp track, on which I had the SansAmp, for some more edge. The singer has a very raspy voice, which I think sounds great, and the SansAmp enhances this. All vocal tracks go to the Group track, on which I have two EQs and the UAD Precision De‑Esser. I use volume automation a lot on individual tracks, so if I use de‑essers on them, it can emphasise the esses. For that reason I prefer to have the de‑esser on the subgroup at the end of the chain. It makes it easier to control things.”

In this video uploaded by Century Media on their official Youtube channel, about 2:00 you can see that John Laux is using a Galaxy Tape Echo for his leads in the studio.