Taka Idea

Crossfader for YouTube Music. Blends tracks between two tabs with custom queue, beatmatch, smart DJ sort, and live party room.

SyncMix – Automated Crossfader, Smart DJ Mix & Live Party Room for YouTube Music Say goodbye to awkward silence between songs. SyncMix brings smooth, automated crossfading, intelligent timing control, harmonic DJ sorting, and interactive party queueing to YouTube Music — transforming your playlists into a non-stop, club-grade DJ mix right inside your browser. 🎶 Build your mix queue, your way • One-Click Queueing: Add individual tracks instantly using the "+ ADD" tag next to any song, or import entire albums and playlists with "Add All to SyncMix". • Intuitive Drag & Drop: Reorder tracks freely using the dedicated grip handle (⋮⋮) with smooth drop indicators. • Send to TOP: Bump any upcoming song to the front of the queue with a single click. ⏱️ Total control over how every track starts & plays • Global IN Start Time: Set a default starting point for incoming tracks (e.g. skip 15s quiet intros automatically). • Per-Track Fine-Tuning: Set independent IN start points and relative PLAY TIME limits for any song using step buttons (±1s / ±10s), text input, or interactive timeline drag handles. Type "--:--" to play through to the end. • Clean Interactive Markers: Drag the green IN and red END markers directly across the waveform timeline for second-precision trimming. 🎚️ Club-grade, zero-latency crossfading • ⚡ CUE Standby Pre-Buffering: The next track is silently pre-buffered on the standby deck right at its IN position (⚡ READY / ⏳ CUING badges) — slashing transition lag to 0.0s! • Smart Auto-Transitions: Crossfades trigger automatically when a track reaches its PLAY TIME limit or song conclusion. • Manual Crossfade: Hit the CROSSFADE button anytime to trigger an immediate blend. • 4 Transition Curves: Choose between Equal Power (Sin/Cos), Club Blend, Linear, or Natural (S-Curve) to match your vibe. • 🎛️ DJ Bass Cut & Bass Swap: Keep the low end punchy and clean with automated EQ bass roll-offs on the outgoing track and seamless mid-transition bass swaps. 🎉 SyncMix Party Room (Interactive Jukebox in the Cloud) • 📱 Guest Voting via Smartphone: Party guests scan a QR code or visit https://syncmix-party.web.app on any phone (iOS/Android, no apps to install, no sign-in required). • 🔍 Search 100M+ YouTube Music Tracks: Guests search any artist, title, or remix and submit tracks directly to the party mix with one tap. • 🗳️ Democratic Upvoting & Token Economy: Guests start with 8 regenerating tokens (+1 every 60s) and upvote favorite songs using an ergonomic vertical stepper. • 📜 Dual-Verified Song Lyrics: Guests can tap "Lyrics" on their phones to view full song lyrics for the current track, verified across YouTube Music and studio databases (Dual-Verified). • ⏭️ Democratic Vote-to-Skip: Guests can vote to skip a track. When the host's custom vote threshold is reached, SyncMix automatically crossfades into the next top-requested track! • 📜 Played History: Guests can browse the full history of songs played earlier at the party. • ⚡ Automated Winner Claiming: SyncMix automatically polls the top-voted guest song right before the active track ends and seamlessly inserts it at the top of your DJ queue. • 🖥️ Fullscreen TV / Projector Display: Launch the dedicated party view (party-qr.html) with a large QR code and live voting board for big screens. • 👑 Mobile Host Moderator Panel: Control the party from the dance floor with your personal host key — pause guest requests, remove tracks, or force the next track on the fly. 🎧 Dual-deck live view & Headphone CUE • Two-Deck Monitor: Track NOW PLAYING and UP NEXT simultaneously with live playhead positions and active play range highlights. • Headphone CUE (3rd Tab): Route a 3rd YouTube Music tab to your headphones in Audio Routing settings to preview upcoming tracks silently while the main mix keeps playing. ⚡ Take it to the next level: SyncMix BPM Engine (Local Backend) Unlock professional DJ beatmatching, waveform graphics, and intelligent automated curation: • 🎛️ Pioneer CDJ / Rekordbox HiDPI Waveforms: Render responsive audio dynamics and beatmaps on 1080p, 1440p, and 4K displays with an ultra-precise Pioneer Playhead Needle. • 🔀 Smart DJ Queue Sorting: Sort your queue with 4 intelligent DJ algorithms: - Smart DJ Flow: Computes the optimal transition path using BPM differences and dynamic intro/outro energy curves (optimized with a 2-Opt chain solver). - DJ Energy Wave: Alternates 3 high-energy peak tracks with 1 cooldown track to keep the dance floor moving without exhaustion. - BPM Ramp Up & Wind Down: Gradually accelerates or cools down the tempo for peak-hour or warm-down sets. - Harmonic Octave Matching: Effortlessly connects half-time/double-time genres (e.g. 70 BPM to 140 BPM). - Live Analysis Progress: Real-time progress bar and track badges show background beatmap generation so you know exactly when your playlist is ready. • 🎯 Smart Phrase Drop & Auto-Outro Snap: Synchronizes transitions to musical 16-beat phrases and natural outro drops, avoiding voice overlaps or sudden energy drops. • 🥁 Beat Phase Alignment: Accurately aligns beat grids at the blend point so kicks land simultaneously without tempo warping. • ⚡ Lightweight On-Demand Engine: Launches and warms up in seconds with local JIT processing and automatic updates. *(Note: SyncMix works standalone for crossfading, Party Room, and cue limits out of the box. Waveform beatmaps, smart DJ sorting, and beatmatching activate when the BPM Engine is running).* 🔒 100% Local & Privacy-Friendly All core mixing runs locally in your browser. No audio is ever uploaded to cloud servers. - - - - - - - - - - - - - - - - - - - - - - - - - Changelog - - - - - - - - - - - - - - - - - - - - - - - - - ### What's New in Version 2.43: • ⚡ 1-Click Engine Auto-Update: Update the companion BPM Engine directly from the extension modal with a live progress bar (0-100%) — no manual folder conflicts, duplicate zip issues, or restarts required. • 💻 Action-First Modal Layout: Action buttons and status indicators are placed at the very top of the Backend dialog for instant visibility on laptop screens without scrolling. • 📁 Permanent AppData Location: The BPM Engine now installs to %LOCALAPPDATA%\SyncMix-BPM-Engine, keeping all analyzed beatmap cache safe and eliminating download clutter. • 🧹 Automatic Post-Install Cleanup: Temporary setup folders and downloaded archives are automatically cleaned up after successful installation. • 📡 Instant Auto-Connect Radar: The extension actively detects when the local engine comes online and switches to green status without clicking reset. ### What's New in Version 2.3: • 🎉 Party Room in Primary Header: Direct access and room status indicator right at the top of the plugin (instant readiness status and live room code display). • 🔀 Smart DJ Queue Sorting: 4 intelligent DJ sorting algorithms: Smart DJ Flow (BPM + Dynamics with 2-Opt chain solver), Energy Wave (3 Peak + 1 Chill), BPM Ramp Up, and BPM Wind Down. • 🎯 Smart Phrase Drop & Auto-Outro Snap: Synchronizes transitions to musical 16-beat phrases and natural outro drops, avoiding voice overlaps or sudden energy drops. • 🎛️ DJ Bass Cut & Bass Swap: Added smooth EQ Low-Cut filters on outgoing tracks and mid-crossfade bass swapping. • 📈 Responsive HiDPI Beatmaps & Timeline Drag Handles: Interactive IN and END marker handles with exact pixel-perfect alignment across all panel widths. • 🎨 Clean, Distraction-Free UI: Streamlined button styling with text-only actions and dedicated circular queue controls. • ⚡ Upgraded Silent BPM Engine v2.3: Self-contained audio analysis engine with instant stdlib WAV processing and on-demand background lifecycle. ### What's New in Version 2.20: • 🎉 SyncMix Party Room Cloud Ecosystem: Invite party guests to pick and vote on YouTube Music songs in real time using their smartphones via https://syncmix-party.web.app — no accounts, no installations, zero cost. • ⚡ Automatic Winner Claiming: SyncMix automatically polls the top-voted guest track right before your active song ends and inserts it seamlessly at the top of your DJ deck queue. • 📱 Real-Time Sync & Phone Wakeup: Instant queue synchronization via Firestore WebSocket listeners plus automatic fresh state re-fetch when unlocking or waking mobile screens. • 🔍 High-Performance YouTube Music Search: Guests search the entire YouTube Music catalog powered by serverless Cloud Functions v2 in Europe with 0 latency and 0 AI overhead. • 📺 Fullscreen QR Mode: Expandable QR code modal inside the plugin and a dedicated fullscreen presentation tab (party-qr.html) designed for projectors and large party TVs. • 🎨 Modern Material Design 3 UI: Refreshed, ultra-responsive mobile web application with a 7-track queue allowance per guest and host moderation controls (pause & track removal). • 🔄 Seamless Local-to-Cloud Migration: Built-in automatic migration configures live production cloud endpoints with backward compatibility for local development.