Here are various notes about starting LibraZiK-4.

Here is what is called the GRUB startup screen:

At the GRUB startup screen, press the ESC key.

Then, use the arrows on the alphanumeric keyboard to select “Advanced options for LibraZiK-4 GNU/Linux” and then press the Enter key.

You will then be presented with a startup list with several different options, including choosing from the different installed kernels, simply select the one you want, then press Enter.

At the GRUB startup screen:

• press the ESC key
• then on the next screen, press the E key on the alpha-numeric keyboard,
• adds then acpi=off after quiet,
• finally, press the F10 key on the alpha-numeric keyboard.

See also this chapter of the LibraZiK installation manual.

Check the volumes of the different channels of your audio interface using alsamixer.