Applies a simple echo to the sound (this effect is also called
Delay
by some audio programs). The gain setting
describes the intensity of the echo, it should always be a negative
amount in dB or a percentage less than 100%. The delay setting
gives the delay of the echo, which is the amount of time after which
the sound is repeated. The further setting, when the
corresponding checkbox is ticked, allows to extend the echo further
than the selection. To appreciate its effect, try selecting a drumbeat
and apply an echo with a delay of 0.2 seconds, a gain of 60% and the
further setting set to 2 seconds.
