FUSER vs StemMaster

FUSER is an audio plugin that detects frequency clashes between tracks and reduces them dynamically, helping competing parts occupy space in a mix. Resolve Conflicts processes detected channel conflicts and frequency masking automatically. Phase Analyze identifies a phase rotation intended to reduce cancellation between layered sounds. Users can adjust mid/side, Q, attack, and release controls, and listen to the Delta signal. FUSER supports stereo processing and offline file analysis, with views for loudness, peaks, stereo balance, phase correlation, dynamic range, loudness range, and tonal balance/EQ. It runs on macOS 10.15 or later and Windows 10 or later; the Mac version is native for Apple Silicon. Mac hosts can use 64-bit AU, VST 3, or AAX, while Windows hosts can use 64-bit VST 3 or AAX. The listed price is £59 as a one-time purchase, and the maker offers a fully functional 15-day trial. A 30-day money-back guarantee is also listed, subject to deactivation and a support request within 30 days of purchase.

StemMaster is a standalone app that analyzes audio stems, mixes and masters them, and explains its processing decisions. It balances, pans, equalizes, and compresses stems according to measured roles, and can detect song sections to automate gain, pan, filters, reverb, and stereo width. Tools include vocal riding and spectral unmasking. Users can supply a commercial reference track to guide tonal balance, width, and dynamics while retaining a selected loudness target. Listed targets are Streaming −14, Club −9, and broadcast EBU R 128 −23 LUFS. The app loads WAV, AIFF, FLAC, MP3, and OGG stems and supports exports including 24-bit audio and 32-bit float WAV. Its built-in analysis engine works offline. An optional AI engine uses the user's own API key and sends measurement summaries, not audio, to the chosen provider. The free demo is the full app, but exporting requires a license and unlicensed mastered playback has a periodic audio tag. It runs on 64-bit Windows 10 version 2004 or newer and Windows 11, or Apple Silicon Macs on macOS 15 or newer; Intel Macs are unsupported. Plans include $9.99 a month, $59 a year, or a 99.00 USD one-time lifetime license.