Close enough
The virtual vinyl sometimes (maybe 2%) plays even if my finger is on the screen. Latency on the virtual vinyl feels to be at least 50 ms on an iPad Mini 4, so it will take some time to get used to timing more intricate scratches. The Mixfaders latency is very close to zero (a good thing). The volume control snaps to the center annoyingly, so you cant adjust the volume close to 100%. (They couldve just relied on the reset button instead of snapping.) This is way closer to scratching on a real turntable than an all digital solution like the Baby Scratch app, but not quite there.
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Mixfader dj app, v1.5.1