Source Audio ZIO User Manual page 6

LOW-CUT:
The LOW-CUT mode is designed to remove excessive low frequency rumble and buildup that
makes it more difficult to get guitars (and sometimes basses!) to sit well in a mix. Unlike the STUDIO
mode, BASS CUT does not have an impact on the low midrange or presence frequencies, and, instead,
reduces the "low lows" to improve headroom and provide a tighter sound. This is especially useful on
guitar neck pickups, some basses, synths, and any other sound that may be too "boomy" and
overpowering in a live or studio mix. If you also have another pedal in your signal chain that has a
problematic low frequency loss when activated, BASS CUT mode can be used as an always on buffer to
reduce that bass beforehand. This way you can have a more even and predictable bass response overall
and compensate accordingly using your amp's tone stack or an "always on" EQ pedal.
STUDIO:
The STUDIO mode is based on a pair of popular studio mixing tricks used on guitar and bass. It
combines an EQ curve based on the famous "Pultec Trick" (used on records since the 1950s and still
today) in combination with other tried and true methods to improve clarity. This mode provides a low
mid cut to remove "mud" frequencies, a gentle presence boost in the upper midrange, and a natural-
sounding high pass filter to reduce low frequency rumble. With this mode, you can achieve a more
"polished" sound that is intended to fit guitars and basses more clearly in a mix without excessive mud
SA271 ZIO User Guide 6