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The authors propose Reference-Based Modulation (RB-Modulation), a plug-and-play, training-free solution for personalization of diffusion models. Existing training-free methods face challenges in (a) extracting style from reference images without additional style or content text descriptions, (b) avoiding unwanted content leakage from style references, and (c) composing style and content effectively. RB-Modulation addresses these issues using a novel stochastic optimal controller, where a style descriptor encodes the desired attributes through a terminal cost. The induced drift ensures high fidelity to the reference style while adhering to the text prompt. Additionally, the authors introduce a cross-attention-based feature aggregation scheme that decouples content and style from the reference image. With both theoretical justification and empirical validation, RB-Modulation demonstrates precise control of content and style in a training-free manner, while enabling seamless composition—eliminating reliance on external adapters or ControlNets.