Channel-based mixing has long been the standard paradigm for audio professionals in both studio and live performance contexts, owing to its intuitive, signal-oriented workflow. While this approach excels in conventional stereo and multichannel formats, it offers limited native support for advanced spatial applications. As immersive audio formats become increasingly popular for virtual and augmented reality, new mechanisms are needed to allow engineers to work directly within spatial domains rather than adapting channel-based setups to fit immersive content. This paper presents an interactive software system for mixing First-Order Ambisonic (FOA) soundfields in real time. The system accepts A-format recordings from tetrahedral microphones, including the Sennheiser Ambeo and the Core Sound TetraMic. It converts them to B-format using a directional beamforming approach, in which the individual dimensions (left, right, front, back, top, bottom) are independently crossfaded between sources. Each directional beam is extracted via a dot product with a corresponding spherical harmonic steering vector, crossfaded between the two input soundfields, and reencoded into a new B-format using an outer product reconstruction. The program architecture is designed to accommodate future extensions to additional Ambisonic microphone formats, including the Røde SoundField, the Zylia ZM-1, and the Eigenmike. This positions the platform toward a microphone-agnostic encoding and mixing platform. By parameterizing the encoding stage through a gain-factored matrix, the directional steering vectors can be reconfigured to reflect the capsule geometry of any tetrahedral target microphone array. Future iterations of the program can extend the beamforming framework beyond the first-order WXYZ dimensions, enabling the integration of higher-order ambisonic encoding to improve spatial resolution and directional accuracy. The primary contribution of this program is a streamlined interface for ambisonic processing, designed to make scene-based mixing accessible to engineers and sound designers working in immersive audio production.
