Ubuntu Studio 22.04 has the relevant software for using the E-MU 0404 PCIe, such as Studio Controls and Jack.
Install the firmware as detailed by this post:
cd ~
wget ftp://ftp.alsa-project.org/pub/firmware/alsa-firmware-1.0.28.tar.bz2
tar xjf alsa-firmware-1.0.28.tar.bz2
cd alsa-firmware-1.0.28
./configure --enable-buildfw
cd emu/
make
sudo make install
Not tested exactly what software from Ubuntu Studio is needed over and above standard Ubuntu installation. Not tested installing the latest firmware from Alsa Project.
This is working for playback. Not tried for recording, but post above outlines problems getting this working.
Tried following the installation instructions from Alsa Project on standard Ubuntu installation, but had some issues getting it to work.
If use Windows 10
I have this driver
https://github.com/ordnasselaD/Driver-PCI-EMU-0404