Khelper V3

KHelper (Karaoke Helper V3) is a free, open-source (MIT) Windows desktop application engineered for VTubers, Utawaku (singing stream) creators, and live OBS Studio vocalists. It consolidates five separate streaming tools—vocal stem separation, virtual dual-track audio routing, broadcast loudness normalization, real-time pitch shifting, and synchronized OBS lyric/setlist overlays—into a single offline workstation.

Key Features: • Dual-Track Audio Isolation: Routes pure instrumental backing to OBS Studio (via VB-CABLE) while sending an independent guide-vocal monitor mix to the streamer's physical headphones with automatic anti-leak mute protection. • Local Offline AI Vocal Separation: Integrates UVR MDX-Net and Demucs locally on NVIDIA GPUs (RTX 50/40/30/20 & GTX) or Standard CPU mode to split MP3, WAV, FLAC, M4A, and OGG tracks into clean Instrumental and Vocal stems with zero cloud fees. • EBU R128 (-16 LUFS) Auto-Loudness Normalization: Eliminates track-to-track volume jumps during live singing streams without touching OBS mixer faders. • OBS Browser Source Lyrics & Setlist Overlays: Serves 12 customizable zero-flicker localhost themes with offline MeCab Japanese Furigana & Romaji, Korean Romanization, Chinese Pinyin, built-in lrclib lyric search, and J-key tap sync. • Vocal Range Key Matching & Non-Destructive Trim: Maps your C2–C6 vocal range to recommend exact SoundTouch semitone pitch shifts, jumps directly to a track's highest/lowest note timestamps, and trims intros/outros non-destructively while keeping lyrics in sync.