Similar to the Snes9x2005 (non-plus) core prior to https://github.com/libretro/snes9x2005/pull/96, Snes9x2002 suffers from an inadequate level of low pass audio filtering, leading to tinny/scratchy sound.
This PR adds a simple optional low pass filter at the mixing output stage. When enabled, audio is more mellow/bassy, and generally improved (with a negligible increase in performance requirements).
Similar to the Snes9x2005 (non-plus) core prior to https://github.com/libretro/snes9x2005/pull/96, Snes9x2002 suffers from an inadequate level of low pass audio filtering, leading to tinny/scratchy sound.
This PR adds a simple optional low pass filter at the mixing output stage. When enabled, audio is more mellow/bassy, and generally improved (with a negligible increase in performance requirements).