First off, just to answer the relevant question about the innofader installation, you should be able to set the curve on the innofader to be as tight as you want for scratching. If you set it too far it will go completely to zero so there's no reason that you should have problems with fast crabs or flares. (From my own experience I have no problems with these on the DB4/innofader combo, but I am a mediocre scratcher at best, so you may be doing far more fancy fast flares than I am). Either way I don't think the DB4 curve itself matters one way or another since the curve is set by the innofader, but perhaps I'm missing something?
Re the DB4 vs the 92: First off, the 92 is a great mixer with extremely solid build quality, so I wouldn't diss it. But I do feel compelled to defend the DB4 against some of Darken's comments above. The first thing that is simply magical on the DB4 for me is the filter mixing. It's not for everyone, but I find it far more precise and subtle than regular or isolation EQ mixing on regular mixers. I've MIDI mapped other controllers to emulate this mode when I use other mixers because I like it so much. For me that alone is the best thing about the DB4.
I'm just not hearing the problems you're having with phono and line inputs. I don't use the line inputs often so that's probably my own ignorance, but 90% of my mixing is straight through the phono inputs and I'm not hearing any problems; certainly nothing that "sounds like garbage." Sure they are a little weaker than the line inputs but that's normal in my experience (is it different on the 92?), and thankfully you can use the gain knob to give them a little boost. It's not a deal breaker by any means -- they are plenty loud for clubs and certainly for my home studio. Googling isn't finding me any major discussions of such weaknesses, and my guess is if they did exist, we'd hear on the A+H feedback page which you called a "ghost town" - it's possibly that way because DB4 owners are too busy enjoying the music to post there Anyway it's possible that I'm just not noticing these problems but this is the first I've heard of them, and I've had this mixer a few years now.
As for the feel of the buttons, that's an individual preference - I've felt some that I like better for sure, but they hardly feel "cheap" to me. You have a legitimate gripe about the lack of send/return (and WTF were they thinking with the lack if inputs on the back of the mixer?), but effects are just effects - they're fun to play with but it's really a side show unless you're a very different kind of DJ than most. What I really like about the DB4 effects is the ability to be very subtle with them (as opposed to Pioneer for example, which are way too overbearing for me), but in the end I don't use them all that often anyway. They would be a lot more useful to me with the ability to save your settings to a button (say on the K2) so that you can easily go back to effects settings that you really liked, but what this model does instead is give you a very different approach to effects. You can play a loop and then play with effects for hours using very subtle changes to create your own tunes. That's a lot of fun, and probably sounds really good if you practice often just like that, but in the end I haven't found myself doing it all that much.
Like I said though the 92 is a great mixer and if you're happy with it, that's terrific. The sound quality difference to me is negligible (I'm actually fairly skeptical that ABX tests will measure any significant differences among the overwhelming majority of listeners), but if you hear differences that are meaningful to you then you should go with what you like best. To me the DB4 sounds great and its layout and filter capabilities make it a really enjoyable mixer to use.
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