The ATSurround Processor (foo_dsp_atsurround) is a legacy matrix decoder DSP plugin for foobar2000. It extracts hidden multi-channel surround sound information embedded within standard 2-channel stereo audio (such as MP3s, CDs, or Dolby Surround tracks) and routes it to 5.1 speaker setups or simulates it over headphones. ⚠️ Critical Requirement Note
Because foo_dsp_atsurround is an older, 32-bit legacy component, it is only compatible with the 32-bit version of foobar2000. If you are running the modern 64-bit version of foobar2000, you should instead use its modern alternative, the FreeSurround Decoder (foo_dsp_fsurround). Step 1: How to Install ATSurround ATSurround matrix decoder plugin for foobar2000 – Head-Fi
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