Some of the treatments provided by AS are represented by BreakPoint Function in the general window. A BPF can be compared with an automation, applied to a treatment, such as a transposition, a time stretch, an amplitude filter or a gain. When a treatment The BPF editor is a graphic interface, designed to edit some treatments whose parametric values can possibly evolve, either in time – dynamic treatments, or over the spectrum of a signal. For instance, the pitch of a sound can be transposed continuously within an eight octaves interval over a given laps of time. The amplitude of the spectral components can be modified depending on their frequency, just as with a very refined filter. The interface of the BPF editor is superimposed on the signal representation – sonogram or waveform.