What synth?
I hate doing this, as normally I prefer to work with what I have, but theres one synth sound that i just cant replicate. I’ve been trying so hard with a 303 replicator, because it sounds very 303ish, but could someone please tell me what the lead sound at 4.50 in this? I’ve been searching for days because I really want to use a similar sound in one of my tracks, and its killing me! I have Massive, if that helps!
The filtered key stabs?
yeah the really hollow stabby sound!
Sounds like something found in very early 90’s house music, plus it might be processed as well post synth. Try looking up how to make a “House Organ” patch, and then from there just tweak it post synth with effects to get it to sound right.
Quick Google search found this, not exactly what you want, but it’s a starting point
Could start with this, and then compress the shit out of it and add some tape saturation/distortion and then add a notch filter.
I found something similar in my Sasha Soundlab, you were right about the notch filter helping to create that hollow sound! vinyl distortion gave it tthat grittyness as well. making a very acid-influenced track, 808 cowbells everywhere.
I actually ended up sampling the original sound and editing it with post-fx, the sasha sounds couldnt be key’d properly so didnt sound right in the mix 
at a rough guess, it’s filtered white noise in a sampler.
Kinda OT but there’s a cool Redshape remix of that which you can check out too:
Also, maybe unorthodox but I use my iPhone to drop a bunch of one shots or samples live over tracks and there’s a cool (also very basic) app with the old school sounds called Rave Box -
and around 25 seconds in you can hear that piano sound, add some filters and you can mess around with that
love that redshape remix! adam beyer posted it on fb a wee while back! ohh i may consider doing that, im thinking of trying to incorperate imaschine into my playing, with an iphone!
Yeah def incorporate iMaschine it’s fun and with some apps with built in metronomes you can get them nicely timed with a live playing track!