NOMZ Studios has introduced a standalone Windows application from that is designed to mix and master full multitrack stems in a single pass, rather than treating mixing and mastering as separate stages.
Where conventional mastering software processes a finished stereo mix or a handful of submix stems, StemMaster works from the complete multitrack: it makes mixing decisions first (levels, pans, per-track automation, riding the vocal through busy sections, ducking bass under the kick) and only then masters the result to a true-peak-limited, LUFS-targeted finish.
Most AI audio tools are a black box: song in, master out, shrug. StemMaster is the opposite. Amber marks show every decision the AI made. Cyan needles dance in real time as section automation and the vocal rider work your mix. And the Engine Notes panel writes it all down in plain English — what was done, to which stem, and why the measurements justified it.
StemMaster features
- Loads full multitrack stems and performs mixing (levels, pans, per-track automation) before mastering.
- Automated vocal riding through busy sections and dynamic bass/kick ducking.
- True-peak-limited, LUFS-targeted mastering output.
- Engine Notes panel documents every automated decision and its measured evidence.
- Manual fader/pan adjustments trigger a re-render that holds the loudness target.
- Loudness-matched A/B comparison between versions.
- Optional bring-your-own-key LLM engine (Anthropic, OpenAI, and compatible providers); sends measurement summaries only, never audio.
- Runs fully offline with no account or telemetry.
StemMaster for Windows is available to purchase for $69 USD. A free demo version is available to download to try the software (exports disabled, periodic audio tag on mastered playback).
More information: NOMZ Studios
