Volcano 2 lets you route the four available filters in
almost any way you can think of. There are 3 basic routing configurations: Stereo,
L/R or M/S. By clicking the main routing button, the routing possibilities
are presented for each configuration depending on the amount of filters used.
The three buttons at the right of the routing button switch between the main routing configurations:
In this default mode, both the left and the right channel pass through all filters. You
can use the Pan rings to introduce differences in cutoff frequencies for each
output channel and thus create beautiful stereo effects.
In this case the left and right channel will go through different filters. This allows for more extreme settings and stereo effects. If there are two filters, the left channel will go only through filter 1, and the right channel will only go through filter 2. If there are four filters, filter 1 and 2 are used by the left channel, and filter 3 and 4 are used by the right channel.
This is the icing on the cake, never seen before in a filter plug-in. Now the
signal is split into a Mid and a Side channel using the sum and difference
of the left and right channels. Each signal is sent through different filters (as in L/R mode) after which
it is reconstructed into the normal left and right channels. The Mid/Side concept
has its origin in stereo microphone techniques using two microphones (more
about that here
on Wikipedia ) but also gives us many options to process a stereo audio