PA1
A special version of the FA 1 and the PA 1 phase analyzer open the opportunity to show the frequency and phase behavior of plugins, devices or a whole effect chain (also called the "BODE graph"). This is done in recording the impulse response of the effect(s) by using an appropriate source file with a single impulse and a certain length as already described at the FA 1 page. During mixing an analyzer is often used to observe the changes of the magnitude of the frequency content. It doesn't make sense to do the same with the phase when realtime audio is playing but it really makes sense to take a look at the phase behavior of the used effects by generating the impulse response. It can give you an indication of what could be wrong if you did use different settings of effects on the left and right channel for instance. While a Goniometer is a more practical tool to evaluate the phase relations of the two channels the method described above is more analytical since you can get information about the phase in comparison with the frequency range.
Under certain conditions it is possible to visualize the frequency and/or phase behavior of external devices. Above you can see the impulse response of one channel of an analog hardware mixer. If the impulse file is played in a loop you can watch the changing of the curves in realtime.
