  We present new observations of the rapid oscillations in the dwarf nova VW
Hyi, made late in outburst. These dwarf nova oscillations (DNOs) increase in
period until they reach 33 s, when a transition to a strong 1st harmonic and
weak fundamental takes place. After further period increase the 2nd harmonic
appears; often all three components are present simultaneously. This 1:2:3
frequency suite is similar to what has been seen in some neutron star and black
hole X-Ray binaries, but has not previously been seen in a cataclysmic
variable. When studied in detail the fundamental and 2nd harmonic vary
similarly in phase, but the 1st harmonic behaves independently, though keeping
close to twice the frequency of the fundamental. The fundamental period of the
DNOs, as directly observed or inferred from the harmonics, increases to ~100 s
before the oscillation disappears as the star reaches quiescence. Its maximum
period is close to that of the `longer period' DNOs observed in VW Hyi. The
quasi-periodic oscillations (QPOs), which have fundamental periods 400 -- 1000
s, behave in the same way, showing 1st and 2nd harmonics at approximately the
same times as the DNOs. We explore some possible models. One in which the
existence of the 1st harmonic is due to transition from viewing a single
accretion region to viewing two regions, and the rate of accretion onto the
primary is modulated at the frequency of the 1st harmonic, as in the `beat
frequency model', can generate the suite of DNO frequencies observed. But the
behaviour of the QPOs is not yet understood.
