DOSBox Staging is a fork of the original DOSBox aimed at getting new features in faster, along with a better overall experience for users.

A new release with version 0.79.0 is out adding in lots of audio improvements like the ultra-rare AdLib Gold surround sound daughterboard is now emulated, DOSBox Staging can now accurately emulate the low-pass filter (and sometimes a high-pass filter too) that most DOS-era sound cards feature, filtering for small-speaker audio systems (PC Speaker, PS/1 Audio, Tandy, and the various LPT DAC options) to give a better experience and a new crossfeed option to mix the channels for some audio that might only play on one ear. There's even more like a chorus effect, adding stereo movement and increases the perceived stereo width, which is especially noticeable on purely mono signals on headphones.

There's also various graphical improvements like a shader reload shortcut, it is possible to override the default, canonical interpretation of the 16-colour CGA/EGA RGBI palette, improved scaling, window transparency support, a new Constant Frame Rate (CFR) presentation mode, which presents a constant frame rate defined by the emulated DOS rate and more.

The ability to mount physical CDs is now (re-)implemented in DOSBox Staging for better compatibility with games like Under a Killing Moon, System Shock, and The Pandora Directive. There's a huge amount more to it that you can read about here.

For Linux users, Luxtorpeda also has support for this new release so you can easily use it with Steam games. You can install it via ProtonUp-Qt two tools I've covered numerous times now like here and here.