Connecting to a virtual machine via serial console

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Add serial port to VM with the settings:
Use named pipe:
<filename for the named pipe (unix-socket)>
This end is the server
The other end is an application

Connect with: 

 socat unix-connect:/path/to/socket stdio,echo=0,raw

Make sure that the serial port is enabled in the VM bios if it doesn’t work.

Converting chiptunes to ogg

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Use xmp to play the chiptune to stdout as wav,
boost the volume with sox (if needed),
encode it with oggenc

xmp -d wav -c filename.mod | sox -v1.5 -t wav - -t wav - | oggenc -o filename.ogg -

or if you want to convert all chiptunes in a directory:

for i in *.mod *.xm; do
    xmp -d wav -c $i | sox -v1.5 -t wav - -t wav - | oggenc -o ${i%.*}.ogg -
done