44100 Hz (the average 80286 system could handle sampling rate for COVOX with 12kHz, the 486SX-33 system with 44kHz). Another limiting factor compared to traditional sound cards was the need to use computationally demanding timer interrupts to play background music, since there was no direct memory access available. However, the sound quality can be increased by software through dithering, thus aliasing noise is minimized and the dynamics are increased (used in Inertia Player and FastTracker 2 as an interpolating option). Compatibility Games The Covox plug couldn't directly substitute any of the popular cards of that age (AdLib, Sound Blaster, Gravis Ultrasound, etc.), but several games / platforms supported it directly. It is also usually used in tandem with a AdLib sound card as said card officially was a music card and while it could be put into a mode to handle sampled audio, it could not play sampled audio and music at the same time. Notable entries include: 688 Attack Sub - Title Music, Sound effects Zorro - plays Samples on Covox Battle Bugs - plays Speech on Covox / requires EMS otherwise no Speech Star Control 2 - Sounds Lemmings – had special promotional edition named Covox Lemmings, released with Covox sound cards; the game is identical to original game but contains a "Covox" level and seven more additional levels (only works with Covox Soundcards for ISA Bus). Pinball Fantasies. Most older Sierra Entertainment games, such as King's Quest and Space Quest series, could output the sound to Covox when selecting "Disney Sound Source". Some Games work with a software emulator called Virtual Soundblaster, such as Wolfenstein 3D, has also native Support for the Disney Soundsource. Others with the Tandy Emulator (TEMU) or Tandy 3 Voice Sound: Eye of the Beholder, Sid Meier's Civilization Duke Nukem 3D, Redneck Rampage, Shadow Warrior supports Disney Sound Source. Music trackers Popular DOS-based trackers used on demoscene included Covox support, for example: Modplay (also ModEdit, DMP, VP and other Mod players from early 1990s) (Up to 4 channel COVOX output or custom assembler routine for user device) Inertia Player (mono, stereo-on-1 covox, with dithering option). Multiplayer by DGS Italian Software Company Galaxy Music Player (can play MODs even on an Intel 8088) Scream Tracker version 2.3 direct support. Version 3.21 through virtual-soundblaster driver. Fast Tracker (mono, stereo, stereo-on-1 mode, with dithering). Impulse Tracker Emulators Emulators existed that allowed Covox to act as if