Pigtronix Echolution-2 Deluxe - Manual (Page 15)

Delay Time Ranges
UPPER BUTTON
SHORT PRESS cycles between:
Short - 10ms  100ms
Medium - 100ms  1sec
Long - 1sec  10sec.
LONG PRESS turns OFF the delay line. This allows the filters
and modulation sections to be used with no delay.
Special Effects
LOWER BUTTON
SHORT PRESS turns on PING PONG. With one tap running,
the echo bounces from left to right. With two taps running,
each tap is assigned to one side and they swap sides on
every repeat. We recommend that PING PONG be used
only when both outputs are used in stereo.
LONG PRESS turn on HALO. This causes the echoes to
cascade up in octaves on each repeat.