soundtronics vs PlayStems

soundtronics reconstructs microphone input in real time. Speak just a single word, and waves of sound begin to ripple outward. This isn’t a simple echo — it’s a live remix, a live rework.

PlayStems is an on-device multi-track stem player and AI audio splitter for musicians, vocalists, and bands to practice, rehearse, and perform with complete mix control. Import multi-track stems or split any stereo song directly on your device into independent vocal, drum, bass, and instrument tracks. Rehearse complex sections, isolate parts to learn by ear, or create backing tracks for live performance—all with zero audio uploaded to the cloud. MULTI-TRACK MIXER & REHEARSAL TOOLS • Synchronized multi-track playback with rock-solid transport stability • Per-stem mixer: adjust volume, solo individual parts, mute tracks, and tweak stereo pan • Variable tempo & pitch: slow down fast passages without changing pitch, or transpose keys • Precise waveform scrubbing and loopable marker ranges for repetitive practice • Master level control and clean library organization by title and artist ON-DEVICE AI STEM SPLITTING • Separate stereo tracks into vocals, bass, drums, and other instruments • 100% private: audio processing runs locally using your device's Neural Engine • No cloud servers, no account required, and no internet connection needed to split • Requires Apple Silicon or recent hardware: iPhone 13 or newer, iPad Pro (2018+), iPad Air (2022+), or Mac with Apple Silicon (M1 or newer) INCLUDED IN THE FREE VERSION Start practicing immediately with full core playback capabilities: • Full mixer, tempo adjustment, pitch shifting, markers, and range looping • 1 song in your library (up to 5 songs if you choose to enable anonymous usage analytics) • Up to 10 successful lifetime on-device stem splits • Standard stem-splitting quality models FULL VERSION (ONE-TIME PURCHASE) A single one-time unlock removes all library and processing caps with no subscriptions: • Unlimited song library capacity • Unlimited lifetime on-device stem splits • Access to downloadable High-Quality (HQ) neural stem-splitting models • Supports Family Sharing across your Apple devices Restore Purchases is available at any time in Help & Settings. Purchases are tied permanently to your Apple ID.