  We introduce a new generic model of a deformed Composite Fermion-Fermi
Surface (CF-FS) for the Fractional Quantum Hall Effect near $\nu=1/2$ in the
presence of a periodic density modulation. Our model permits us to explain the
recent surface acoustic wave observations of anisotropic anomalies[R.L Willett
et al,PRL vol78,4478 (1997);J.H.Smet et al, PRL vol 80,4538 (1998)] in sound
velocity and attenuation--appearance of peaks and anisotropy-- which originate
from contributions to the conductivity tensor due to regions of the CF-FS which
are flattened by the applied modulation. The calculated magnetic field and wave
vector dependence of the CF conductivity, velocity shift, and attenuation agree
with experiments.
