  Sco X-1 has been the subject of many multi-wavelength studies in the past,
being the brightest persistent extra-solar X-ray source ever observed. Here we
revisit Sco X-1 with simultaneous short cadence Kepler optical photometry and
MAXI X-ray photometry over a 78 day period, as well as optical spectroscopy
obtained with HERMES. We find Sco X-1 to be highly variable in all our
datasets. The optical fluxes are clearly bimodal, implying the system can be
found in two distinct optical states. These states are generally associated
with the known flaring/normal branch X-ray states, although the flux
distributions associated with these states overlap. Furthermore, we find that
the optical power spectrum of Sco X-1 differs substantially between optical
luminosity states. Additionally we find rms-flux relations in both optical
states, but only find a linear relation during periods of low optical
luminosity. The full optical/X-ray discrete correlation function displays a
broad ~12.5 hour optical lag. However during the normal branch phase the X-ray
and optical fluxes are anti-correlated, whilst being correlated during the
flaring branch. We also performed a Cepstrum analysis on the full Kepler light
curve to determine the presence of any echoes within the optical light curve
alone. We find significant echo signals, consistent with the optical lags found
using the discrete cross-correlation. We speculate that whilst some of the
driving X-ray emission is reflected by the disk, some is absorbed and
re-processed on the thermal timescale, giving rise to both the observed optical
lags and optical echoes.
