  We analyze RXTE/PCA observations of GX339-4 in the low spectral state from
1996--1997 and show that the pattern of its spectral and temporal variability
is nearly identical to that of Cyg X-1. In particular, a tight correlation
exists between the QPO centroid frequency and the spectral parameters. An
increase of the QPO centroid frequency is accompanied with an increase of the
amplitude of the reflected component and a steepening the slope of the
underlying power law. Fourier frequency resolved spectral analysis showed, that
the variability of the reflected component at frequencies higher than ~1-10 Hz
is suppressed in comparison with that of the primary emission.
