Brotha, don’t try and make me feel like an idiot for doing my best to grow as a DJ. I asked so I could learn what others have experienced and learned. There’s no crime, and definitely no reason for something like that to be posted in reply.
Has anyone found any problems mixing with certain keys together including sharps/flats?
Yes, but not ‘certain’ keys. It’s all about the relative key from one track to the next.
Xone was being a dick because your question–especially the clarification–doesn’t make any sense.
Go read about music theory or at least those posts I linked.
I also get irritated because there is a huge trend on this forum with people putting mixed in key on a pedestal and even people recommending beginners who have never DJed in their life get mixed in key when they start which is ridiculous and is a great way to over complicate and hinder the learning process.
I feel like with digital djing there is a tendency to try to do everything visually instead of by ear. We look at waveforms and mix visually instead of wearing headphones and now we have people looking at a camelot wheel and key tags to determine what songs we pick instead of actually listening to them to see if it sounds right.
Just look at this thread: I am not moving forward with skills
here’s the guys mix that he did using mixed in key and he can’t figure out what’s wrong with it…
https://soundcloud.com/jay3kay/why-cant-my-set-be-as-exciting#
For sure. I have used mixed in key pretty much since it came out, it is definitely a great weapon to add to your arsenal but your # 1 tool is your ears mate.
Don;t trust anyone with that much small print. You know they are going to get you sometime 
blahblahblahblahblahblahallpersonalassetstransferredtomixedinkeyllcupondeathblahblahblahblahblahblahrandomcreditcardchargesatmixedinkeyllcsdiscretionblahblahblahblahblahblahblahblahblahblahblahblahohanddiwementionthatclientssoulisoursonceyoupurchasemixedinkeyfrommixedinkeyllcblahblahblahblahblahblahbyacceptingtermsofserviceyouadmitthatyoukilledjfkblahblahblahpleasewaitwhilewecontactthefbiblahblahblahblahblahblah
I knew it, he’s a virus.
Right! This is exactly what happens to most people nowadays and they even have the guts to call themselves “DJ”. Sucks!
I think that mixed-in-key is helpful to many others. But it doesn’t mean that you have to rely on it all the time. But personally, I think it’s stupid and I will never use it. Same thing applies to auto sync.
My mixed-in-key are my ears and brain. 
Hehe, my #1 tool is definitely NOT my ears. Sorry couldnt resist.
I actually don’t have a problem with it. But…I remember spinning for like half an hour without headphones on vinyl because I forgot to pack them while someone else ran to my apartment. I was structuring things based on the grooves in the record and beat matching based on the channel meters on the mixer.
Visual tools are like everything else…tools. I did an impromptu thing last night with a couple friends after goofing off with Maschine for a few hours. It started out just wanting to show them how well Maschine worked when sync’d to Traktor. It was supposed to be a 5-minute thing, so I didn’t bother plugging in my audio interface or headphones and just used the headphone jack on my laptop into some little Bose thing made for iPods.
I ended up spinning for like 2 and a half hours in my buddy’s kitchen, just having fun and drinking…adding Maschine here and there, making simple beats on the spot to play over breakdowns and to accent certain tracks. All purely visually. Yay sync. And yay detailed waveform views.
I’m a tremendous fan of the technology that actually works and makes my life simpler, easier, or more fun. That doesn’t mean that I regret learning on vinyl or that I don’t think there’s any value in traditional DJing, but there is something absolutely wonderful going on with technology. I don’t think it’s right to completely discount it.
My beef with Mixed in Key isn’t that it’s new or automated or taking away the skill of harmonic mixing by ear. That’s all crap. My beef with MiK is that it sucks at what it does and the company bills it as the end-all, be-all of music theory when the system they propose is both more limited and more convoluted than just taking a month’s worth of piano, guitar, or voice lessons.
I don’t hate it because they make it easier for new DJs…I’m mad because they make new DJs suck.
Oh…I see what you did there.
Read up on Cadences. It’s kinda cool.
It’s also a bit overblow and has more to do with the chord progressions used than just the keys of the track…which makes it a lot more complicated. And unless you’re actually going to take the time to learn to play all of the pads/melodies from the tracks you’re using…it just flat-out works better to rehearse the transition in your headphones right before you do it life…if you have time.