  The majority of fast millisecond pulsars are in binary systems, so that any
periodic signal they emit is modulated by both Doppler and relativistic
effects. Here we show how well-established binary models can be used to account
for these effects in searches for gravitational waves from known pulsars within
binary systems. A seperate issue affecting certain pulsar signals is that of
timing noise and we show how this, with particular reference to the Crab
pulsar, can be compensated for by using regularly updated timing ephemerides.
