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arXiv · 2510.21667

FlowSynth: Instrument Generation Through Distributional Flow Matching and Test-Time Search

Qihui Yang·Randal Leistikow·Yongyi Zang
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Abstract

Virtual instrument generation requires maintaining consistent timbre across different pitches and velocities, a challenge that existing note-level models struggle to address. We present FlowSynth, which combines distributional flow matching (DFM) with test-time optimization for high-quality instrument synthesis. Unlike standard flow matching that learns deterministic mappings, DFM parameterizes the velocity field as a Gaussian distribution and optimizes via negative log-likelihood, enabling the model to express uncertainty in its predictions. This probabilistic formulation allows principled test-time search: we sample multiple trajectories weighted by model confidence and select outputs that maximize timbre consistency. FlowSynth outperforms the current state-of-the-art TokenSynth baseline in both single-note quality and cross-note consistency. Our approach demonstrates that modeling predictive uncertainty in flow matching, combined with music-specific consistency objectives, provides an effective path to professional-quality virtual instruments suitable for real-time performance.

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Qihui Yang, Randal Leistikow, Yongyi Zang. 2025-10-24. FlowSynth: Instrument Generation Through Distributional Flow Matching and Test-Time Search. https://arxiv.org/abs/2510.21667

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