The Pioneer CDJ‑350 and DJM‑350 are entry‑level pro gear (no USB‑MIDI HID for VDJ natively).
A skin won’t add hardware control – it changes Virtual DJ’s visual interface to look like those models.
For actual control, you’d need a MIDI mapper (separate).
Most 350 skins require 1366x768 or 1920x1080. If the skin looks squashed: virtual dj skin pioneer cdj 350 djm 350
Fix: Virtual DJ’s native filter is digital. Go to Config → Options → Effects Quality → Set to "High." Also, map the filter to the "Pioneer Filter" effect, not the default "Flanger." The Pioneer CDJ‑350 and DJM‑350 are entry‑level pro