  An interaction of non-uniform plane elastic modes of the waveguide type with
monolayer and double-layer quantum Hall systems is considered. It is shown,
that unlike the case of the surface acoustic wave propagation, the restriction
on maximal values of the wave vectors for which the velocity shift can be
observed experimentally does not take place for the waveguide modes. In case of
study of incompressible fractional quantum Hall states the effect can be used
for measuring a dependence of the effective magnetic length on the filling
factor and for observing phase transitions in double-layer system under the
interlayer distance variation
