A2B (Audio2Blender) is a tool that streams live audio data directly into Blender's Geometry Nodes without requiring baking, keyframes, or drivers. It writes volume and Fast Fourier Transform (FFT) bands into a custom Geometry Nodes attribute, which can be accessed using the Sample Index node. The tool supports multiple audio inputs and allows users to configure the number of FFT bands and set custom frequency ranges between 20 Hz and 20 kHz. It is designed exclusively for real-time viewport interaction and experimentation, such as live visualizers and procedural animation, and currently does not support offline rendering or baking.