The echo is enabled by tapping the button on the XY-pad.
The echo is a standard Schroeder nested all pass filter (invented in
1962), courtesy Valhalla
On the XY pad, the following parameters are set out:
Vertically, the density is set out. The lower half are
pre-echos. The upper half are the transients and the feedback. In the
middle, transients are maximally smeared. This is the feedback of the
From left to right the delay feedback is set out. With the left
half retrieving the pre-echos before the actual signal, and the right
half with a standard echo. This axis specifies the feedback of the
outer delay line.