How do I do a stereo hifi A/B listening comparison?

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GE a/b switch box: https://amzn.to/3YYxD9Y
Yaqin SD-CD3: https://amzn.to/3FffH4b

Hookup:
Use the Yaqin: DAC ~~ GE input ~~ GE output 1 ~~ Yaqin ~~ Parasound input 1
Bypass the Yaqin: DAC ~~ GE input ~~ GE output 2 ~~ Parasound input 2

Other: https://amzn.to/4jpNC8d
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My gear:
Logitech Universal remote: https://amzn.to/40kKtjr
https://amzn.to/46Gi3Eg
PS Audio FR5:    • Holy shit batman…this music is from a spea...  
Eversolo DMP-A6 streamer: https://amzn.to/42JJ6uY
Cardas Parsec RCA: https://amzn.to/4aS3NYi
WBC RCA: https://amzn.to/40f6qQ5, https://amzn.to/4brrOqh
WBC XLR: https://amzn.to/3PEBwvm
WBC Ultimate speaker wire: https://amzn.to/4gZYY28
Cardas Clear USB: https://amzn.to/3WgHc3q
Radial JDI Stereo: https://amzn.to/40OFmIX
Ifi Supanova power: https://amzn.to/3xVnikF
Micca https://amzn.to/3ZX924H
GearIT https://amzn.to/4gOb66F
IsoAcoustics https://amzn.to/3W25DR5
APC Surge protector with master/slave to automatically turn other components on or off: https://amzn.to/44MOosg

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AUDIO CHAIN: 2.2 setup
I did horizontal bi-amping, active crossover @80Hz HighPass.

Apple Music~~Verizon 5G~~Netgear AX6000~~quietest outlet~~Eversolo DMP A6+LPS~~Cardas Clear USB~~Denafrips Iris 12th+Isopuck~~I2S 1.6’ HDMI~~Denafrips Pontus II 12th-1+Isopucks~~Cardas Parsec RCA~~Yaqin SD-CD3+iFi Supanova power~~Cardas Parsec RCA~~to *

SPEAKER tweeter: Parasound 2100 highpass 80Hz RCA~~Cardas Parsec RCA~~NAD C298~~25' GearIT 10 AWG speaker wire~~PS Audio FR5+Isopuck

SPEAKER mid: Parasound 2100+Isopuck+iFi Supanova~~WBC Mogami RCA 1.5'~~Radial JDI Stereo~~25' WBC XLR cable~~PS Audio S300~~WBC Ultimate 9 AWG speaker wire~~PS Audio FR5+Isopuck

SUBS: PS Audio S300~~Micca speaker wire~~2 independent sealed subs active crossover 40Hz on 2ft stands+Isopuck
---
ENGLISH DEMOS: song,artist

Goosebumps:
TonightIcelebrateMyLove,SpeakSoftly,YaoSiTing
AsLongAsHeNeedsMe,ShirleyBassey
IwillAlwaysLoveYou,LucyThomas
LOVE,OliviaOng
StealThisNight,Rocco
WindmillsOfMyMind,SusanWong
PhantomOfTheOpera
QuandLaGuitar,French Latino
Costumbres,IngridContreras
YouAreNotAlone,MichaelJackson
AmigosParaSiempre,WendyKokkelkoren

Soundstage:
StarryStarryNight,BestAcousticVoices
SideStreets,SaintEtienne
InTheAirTonight,PhilCollins
GiveLifeBackToMusic,Georgio
ComeFlyWithMe,Lately,Go,Emotion,SimoneKopmayer
BabyIt’sColdOutside,Kelly Clarkson,JohnLegend
LoveIsAlosingGame,Banda&Anekka
IFeelItComing,EveStJones
Solamente,LisaLopez
WhileMyGuitar,Beatles
PinkPanther,HenryMancini
Emotion,SamanthaSang
She,TheWorldWeKnewJoshGroban
AveMaria,Mirusia
LetYourselfGo,Elvis
ThisMasquerade,KarenSouza

Jazz/male:
ThereMustBeAnAngel,KevinSimm
IfIneverSingAnotherSong,IngmarJurs
YouAreTheSunshine,StevieWonder
FelizNavidad,Bocelli
HoldMeNeverLet,Rocco
MyEyesAdoredYou,FrankieValli

Bass/pop:
Truth,AlexEbert
AdoreYou,JavierPenna(remix)
JumpinJackFlash,Amazonics
SexOnFire,Cannons
NothinOnYou,BrunoMars
OneTwoStep,Ciara
PriceTag,JessieJ
ToSirWithLove,TinaArena
OopsIdidItAgain,Brazil
NotMyFault,Renee&Meg
Mooo! DojaCat
InMyMind,Cassette
IloveYouBaby,Emilee
SawYouInAdream,JapaneseHouse
KissingAfool,GeorgeMichael
Kiss,Prince
NewLight,IfeelItComing,EveStJones

Drums/cymbals:
AlittleMoreLove,OliviaNewtonJohn
Creep,RadioHead
Amazing,GeorgeMichael
LoseThatGirl,Sylvie,SaintEtienne
LoveFool,Cardigans
TiAmo,Mimi
TheGameOfLove,DaftPunk
YouBelongToMe,JenniferLopez
BillieJean,PYT,Bad,MichaelJackson
SheWorksHard,DonnaSummer
HowWonderfulYouAre,SimoneKopmayer
One-sidedLove,SylviaBennett
InMyLife,Beatles
ChangeOfHabit,Elvis

Piano/vocalist:
FlyMeToTheMoon,SylviaBennett
BoulevardOfBrokenDreams,DianaKrall
Superstar,Carpenters
AiDuaEmVe,QuynhLan
LoveWillKeepUs,SusanWong
SoManyStars,JaneMonheit

Jazz/female:
SoThisIsLove,EmilyWatts
IhaveNothing,LucyThomas
TheLookOfLove,NickiParrott
IwillWaitForYou,ConnieEvingson
Jekyll&Hyde
SoInLove,KD Lang
ShadowOfYourSmile,PaulineLondon
Snowbird,DanaWinner
KissOfLife,Sade
Emotions,BrendaLee
IwishYouLove,Laufey
YouBelongToMe,JenniferLopez
EveryBreatheYouTake,KarenSouza
Don’tCryOutLoud,MelissaManchester
ColorsOfTheWind,Mirusia
SoThisIsLove,Sneha
IdreamedADream,SusanBoyle
—-
WORLD DEMOS:

Armenian
Mi Kna,AdissHamanian

Chinese
WangJiTa,ShirleyKwan

Dutch
HijWasPasAchttien,ConnieVandenbos

French
SiTuN’existePas,NathalieAlbert
LaVieEnRose,LucyThomas
Avant-deNousDireAdieu,JeaneManson
T’asLeLookCoco,LaRocheValmont

Italian
SeSepentoIlSole,KhatchigZenian
Caruso,GiuliaFalcone
IlCieloInUna,FrancescoGatto
Caruso,WendyKokkelkoren

Japanese
Nostalgia,Ikimonogakari

Kazistan
EtSiTuN'existaisPas,MadeInKZ

Latin
LaGataBajo,Y Volvere,Lucero (female)
NeverNeverNever,DanaWinner
ElHombreQueYoAmo,MiriamHernandez
SiNoDejan,ShaliaDurcal
MalaSuerte,VikkiCarr
UnosCalleNosSepara,Rafaelito
Adelante,IsabelPantoja
EsPorTi,Juanes
Libertango,ArtemUzunov

Vietnamese
DiemXua,MocSan
BietKhuc,KyNiem,QuynhLan
JePenseÀToi,ThùyDung
TinhBoVo,MinhTuyet&BangKieu
TinhBoVo,PhuongDiemHuyen&TrungDung