Gear you regret selling!
Sold a number of things back in the day when they were not worth as much as they are now #TheSellersRemorse
Roland Alpha Juno 1
Roland MKS-50
Roland PG-300
Roland R8MkII
Electrix Mo-Fx
Electrix EQ-Killer
Pioneer EFX-500
Crown DC300A
the Juno 1 used to be dirt cheap - now people are asking crazy prices for them… aye bwoy
I had the electrix MOFX as well. It was great fun. Especially the filter factory. I wish I hadn’t sold it.
Other things I wish I hadn’t sold:
-Korg Prophecy
-My Motu 828 mk2 (though the mk3 is out)
I lost my Juno 1 in a fire 5 years ago. First keyboard I ever owned, but I didn’t feel like it aged very well (sounded weak to me). I still miss it, mostly for nostalgic reasons.
Vestax PMC 05 proD Samurai. Hands down a nostalgic piece of my gear during the early days. it freakin auto crab for gosh-sakes!!! 
I’ve still got my MoFX, Filter Queen and EQ Killer 
but I do regret selling my Xone:4D 
Vestax PDX-A2 Mk1
SMAC 2.0
Kontrol DJ KDJ400
Celestion KR2 Speakers
Rotel Power Amp
Carver Power Amp
Intimindation APEX mixer.
M-Audio Fastrack Pro
Technics 1210 Mk2
Honestly its not so much even that I sold the gear, but what I sold it for in times of trouble, lust, whatever.
808
909
Technic 1200s
A&H 1D (2 of them)
NI F1 (even though I said i hated it)
Maschine (not sure yet, but I may miss it)
My f1, albeit at the time I thought it was crap!
I only lost $20 on it, but now I’m looking for another
Eks otus
Quality, beautiful product. Just looking at it made you want to play with it. Great sound card too.
Rane TTM 56s (used with Audio 8DJ), build quality was solid
Pioneer DJM T1 (sold it for the Kontrol Z2 cause I wanted post fader fx… then Pioneer released a firmware update for post fader fx :l )
Moog Little Phatty - I’m hardly home so I found myself using VSTs more then my hardware, but now that schools finished i’ll be home a lot more.
My drumset. Cherry Yamaha stage custom 
My Krups cappuccino maker.
Damn, that was a fine percolator 
hands down my DJM-T1… combined with two 1200’s i was literally unstoppable
Glad you don’t regret selling your X1 which I still rock every time I’m on turntables 
I hear ya. But I’ll raise you a 07 ProD. I sure do miss that mixer…
I did briefly regret flogging my Soundlab DLP1 Turntables in the mid 90’s to fund the purchase of Technics 1210 MK2’s (which are still going strong), I say regret, it was a passing moment as I just couldn’t get on with the 1210’s for a couple of months, it was a real struggle to beatmatch.
Technics 1210s mk3’s!!!
I’ve never sold anything else since. I’m a little audio equipment hoarder now.
My cdj 2000s nexuses…but I had to an engagement ring so it was worth it.
My pristine 1210mk2’s which i cleaned inside and out, LED modded and grounded, especially what i sold em for
They still sell them at an extremely discounted price.
Friggin’ awesome controller, if NI did HID, it would have made it the perfect cdj replacement.