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Note that some of these filters may reduce volume a bit, so you may want to boost RA's volume level to compensate. If you want to remove the filter, press Start when the DSP Filter option is highlighted.
The filters and their presets can be found [https://github.com/libretro/RetroArch/tree/master/audio/filters audio_filters here], which the DSP filters can be built for your platform with the makefile. Some precompiled Windows x64 These files should be included in nightly builds of these filters can be obtained [https://www.mediafire.com/?89eu6fk5kx8z39a here]from the buildbot.
===SoftFilters===
Classic emulator filters like SuperEagle or Blargg's NTSC have been available as bSNES filter plugins in the past, which is no longer supported in bSNES/higan but was still available in RetroArch. However, this filter format was recently replaced with the SoftFilter spec, which has been upgraded to support more platforms, multi-threading and SIMD usage. The filters are dynamic libraries which are loaded in RGUI under Settings\Video\Soft Filter, which will apply the filter before any shaders are applied.
The filters are found [https://github.com/libretro/RetroArch/tree/master/gfx/filters video_filters here], which can be built for your platform with the makefile. Precompiled Windows x64 These files should be included in nightly builds can be found [https://www.mediafire.com/?o9r9n8u7njwygcz here]from the buildbot.
Note that these filters are WIP and may not work with all cores as they need to have codepaths for the pixel format the core uses (either 32bpp XRGB8888 or 16bpp RGB565). Blargg's NTSC is currently limited to 16bpp cores for example (bSNES is 32bpp so it won't work, but SNES9x is 16bpp so it works there). Cores that use Libretro GL for 3D like Mupen64plus can not use these filters.
