Uh, do you want to play the digital files through controller jogs or have you though of using DVS? Either way, I’m gonna give few equips to check out. I’m assuming here you don’t want to spend more on controller/mixer than what SX2 costs.
Denon MC7000: It is much like SX2, has few differences here and there and it’s also capable for DVS. It’s little cheaper than SX2 and you get the famous Denon DJ build quality. Imho better (and cheaper) option than SX2
Numark NS6II: Now this is a brand new controller. In my knowledge it’s not capable for DVS but it can run vinyl players through channels 3 and 4. NS6II is much different from MC7000 and SX2. It’s missing a lot extra features that those two has (seems like you’re not into too much to them anyways) but it has some features that they don’t have like filter roll and filter FX. And those jogs are really sexy and handy showing important data of the playing track like BPM. And this is also 200-300€ chapter than MC7000 and SX2.
Reloop RMX-90 DVS: Well at the price point of SX2 this is a really good looking mixer. It’s DVS ready so your option to play digital files through this would be using DVS system. But then again, you say you have 2 turntables and you don’t need much ‘extras’ on the equipment so from mixers even the cheap Akai AMX (a bit over 200€) might do the thing. It’s capable for DVS and has dedicated filter knobs, ha!
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