NOMZ Studios has officially launched StemMaster, an innovative standalone application designed for Windows users that streamlines the process of AI-powered stem mixing and mastering. This new software aims to bridge the gap between simple one-click mastering tools and complex, manual DAW mixing workflows. StemMaster offers a comprehensive solution for producers, mix engineers, and artists who need a finished master from multitrack stems without the need to build an entire mix session from scratch.

StemMaster distinguishes itself by processing full multitrack stems in a single pass, rather than separating mixing and mastering into distinct stages. This approach allows the software to make informed mixing decisions first, such as balancing levels, adjusting pans, and applying per-track automation. For instance, it can dynamically ride vocals through busy sections or duck bass frequencies under the kick drum. Following these mixing adjustments, the software then proceeds to master the result, ensuring a true-peak-limited and LUFS-targeted output that meets industry standards.

Unprecedented Transparency in AI Audio Processing

One of StemMaster’s most notable features is its commitment to transparency. Unlike many AI audio tools that operate as a “black box,” StemMaster provides detailed insights into every decision it makes. The Engine Notes panel logs each adjustment, explaining which track was modified, by how much, and the measured evidence that justified the change. Moreover, users can observe the AI’s work in real-time as faders move and cyan needles dance, visualizing section automation and vocal riding. This level of transparency empowers users to understand and trust the AI’s process. Furthermore, it offers a live A/B console for loudness-matched comparisons and allows users to manually tweak any stem after the AI master, with StemMaster re-rendering around their changes in seconds while maintaining the loudness target.

A Full Suite of Mixing and Mastering Capabilities

StemMaster integrates a wide array of professional mixing and mastering tools, all of which are “evidence-gated.” This means the software measures the audio first and only applies tools that are justified by those measurements, avoiding blind preset application. The application includes features such as stem-aware AI mixing for balancing and EQing each stem by its role, section automation to detect song structure and apply dynamic changes, and a precise vocal rider. It also incorporates spectral unmasking for surgical frequency adjustments, punch tools like transient shaping and parallel compression, and three types of reverb (plate, room, hall). The master bus is complete with EQ, mid/side EQ, glue and multiband compression, saturation, stereo width control, and mono-bass fold. For loudness, it targets streaming-friendly -14 LUFS or club-oriented -9 LUFS with 4x oversampled true-peak limiting and a soft clipper. Additionally, it boasts closed-loop refinement, where it listens back to its own render and corrects itself, and reference matching to steer towards a commercial track’s tonal balance and dynamics.

Privacy-Focused and User-Friendly

NOMZ Studios designed StemMaster with user privacy in mind. It operates as a genuine desktop application, not a cloud service. All audio analysis and rendering occur locally on the user’s computer, ensuring that music never leaves the machine. There is no subscription model, no account required, and no telemetry or usage tracking. Users purchase a lifetime license with free updates across the 1.x series. While it includes a built-in analysis engine that works fully offline, an optional LLM engine can be enabled with the user’s own API key from providers like Anthropic or OpenAI, sending only compact measurement summaries, never audio. StemMaster is a standalone application, meaning no DAW or Python is required; users simply bounce their stems from their preferred DAW and import them into 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.
• Supports WAV, FLAC, and MP3 stems for input and 16/24-bit WAV, FLAC, and MP3 for export.

Price
Intro: 69.00 USD
Regular: 99.00 USD

More info: NOMZ Studios | StemMaster