Audio Damage Filterstation - Manual (Page 11)

Click on the symbol to choose the corresponding routing configuration:
Series Parallel Stereo
Note that it's not difficult to create configurations in which no sound at all comes out of Filterstation. Suppose,
for example, you use the Series routing and band-pass types for both Filter 1 and Filter 2. If the frequency
settings of the two filters are far enough apart, nothing will come out of Filter 2: only a narrow range of
frequencies will be emitted by Filter 1, and these will be blocked by Filter 2. However, if you were to switch to
the Parallel routing, you‘d hear an interesting double-peak effect, since the raw input signal would enter both
filters and their outputs would be mixed.
Filterstation uses separate filters for the left and right channels, so a stereo signal path is present regardless
of the routing configuration.