FLUX StereoTool v3 v21.12.0.50123 VST AU AAX WiN macOS x86 x64

FLUX StereoTool v3 is a free stereo imaging and analysis plugin for producers who want to adjust channel balance, shape stereo width, and inspect phase relationships. It suits home studio mixing tasks, from repositioning a stereo recording to checking how left and right channels interact.

Separate input gain and pan controls let you adjust each channel independently, while global width and pan settings handle the overall stereo placement. Individual polarity switches can help correct a reversed channel when that is the cause of a phase problem. A vectorscope shows the stereo image, input and output PPM meters track levels, and a continuously active correlation meter helps you spot potential phase issues.

For comparing adjustments, two parameter slots hold complete A and B setups. You can copy settings between them during playback or blend between their values with the morphing slider. Host automation support lets you record those transitions, and global presets store both setups plus the slider position. StereoTool also supports Open Sound Control and requires neither a dongle nor license activation.