Hidden in the depths of the Line6 Spider Jam lurks an awesome SID emulator written by the lead software engineer who worked on the project. There are some 450+ chip tunes hidden in the amp.

For the first easter egg:

* Press Drum/Song until you get the menu with the 3 options
* Turn the wheel clockwise (sitting on the Play Preview option) for around 10 seconds, until you see it…

For the second easter egg:

* Press Drum/Song until you get the menu with the 3 options.
* Push the 4-way switch up around 16 times in a row, sitting on “endless play”, until you see the message
* The “songs” “drums” and “recordings” tabs will disappear until you reboot the unit.

From this new Song/Drums menu, you can:
* Turn the wheel to load some other tunes
* Press play to start/stop the tune
* Press nav left/right to move quickly inside the tune
* Press nav down to “alter the tune”, you can mute a voice, change the semitones and speed (speeding up does not sound good but it’s normal in fact…)
* Press record to set loop points inside the tune and export the loop to the normal spiderjam recordings (mic track)

* You can use any of the Line6 4 button floorboards :
A : Start/Stop
B : mute/unmute voice 1
C : mute/unmute voice 2
D : mute/unmute voice 3

Update(via Hans at Vettaville.nl): it has been confirmed that these easter eggs were removed in software versions > 2.0  Too bad…