In the meantime I've just noticed this post on HA (I think Wombat participated in the thread) which very neatly shows the two effects of a steep filter namely pre-ringing and pre-echo (and post for each too). The middle row (impulse) just shows ringing (the blurry horizontal line showing spuriae in the transition band). This can also be seen in the top row (castanets) The bottom row (tone sweep) shows this again with also pre- and post echoes being the diagonal purple lines. I'm not quite sure why the impulse (middle row) and casanets do not show pre and post echo though.
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