If your sound is not working, it could be that Fatdog64 just doesn't have a driver for it. Or more likely, the volume is muted or the wrong sound card has been chosen as the default. Even if you only have one sound card, often that card will have several functions driven by different drivers, so it looks like multiple sound cards to Fatdog64.
The volume icon in the task bar only adjusts the Master volume,
not any other channels. To adjust the other volume settings, open
AlsaMixer, found under Sound in the
Control Panel or by clicking on the sound icon in the tray
and selecting "Mixer". This application does not
use the mouse. You'll need to use the arrow keys to move
and adjust the volumes.
The m key mutes and unmutes a
channel. Note that you can turn the volume up on a channel and
still have it muted, so make sure that mute is off if you want a setting to be in effect. At the
bottom of each channel it should show 00, if it shows MM
Headphones and external speakers: Also in AlsaMixer, the
Auto-Mute column allows you to choose what happens when headphones or
other speakers are plugged in: whether the built-in speakers will be
muted or still play. Use the up and down arrows to select.
To select the default sound card start the Fatdog Default Soundcard Wizard, found in Sound in the Control Panel. Select the device to use as the default and then use AlsaMixer again to make sure everything is turned up and unmuted. You also use the same wizard to send audio to a bluetooth device.