Emulate other USB device classes

[zettadirac]

I am new to the Arduino/Digispark libraries. I know emulating HID class is possible.
Is it possible to emulate other USB device classes and USB vendor ids?
If it were possible then which libraries would allow me to emulate other USB device classes?

For example: I want to emulate the audio USB class and play a song hard coded in the firmware.

[digistump]

You can only emulate low speed devices - the V-USB based libraries are all about emulating HID, because there is likely little else that can work with such a low speed device and so little ram