From the Swart amps website:
Attenuation settings (4 Attenuation Levels)
Filament BULB Compression Mode This mode runs the attenuated signal through a Swart jewel lamp filament, bringing a subtle tube compression/brown sound goodness. Ever wonder what your signal sounded like through a light bulb? You'll be addicted in seconds. NOTE: This switch ONLY works with LEVEL chickenhead at 12oclock Bypass compression mode Removes the light compressor out of the circuit for more natural dynamics. With level at 12oclock, this is least attenuation/highest volume setting. Heavy duty 3 position Switch This main chicken head switch allows you to switch between FOUR different attenuation settings. At first setting, or 12oclock, the NL can cycle between the COMP and DECOMP switch which brings two levels. DECOMP is least attenuated or loudest setting with COMP position bringing more attenuation via the bulb filament. Turn the switch to 2oclock will bring more attenuation, bypassing the DECOMP/COMP switch. The lowest setting is about the same loudness as your guitar strings.
Comes with box
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