To ensure that the e2deesser doesn't miss the initial Sibilants transients, a lookahead option is often necessary. By introducing a slight delay, the detection algorithm is able to process the onset transients and thus, the very initial sibilants are detected.
The lookahead option has three different settings which may be access through the Configuration Menu:
Zero Delay disables the lookahead option. There is no latency induced in this mode.
Lookahead time at 5 and 15 ms induce a latency which is automatically compensated by your DAW.
This setting is not stored in the DAW's session file, the Presets or the Snapshots but is stored in a separate setting file that is shared with all instances of the plugin on the user’s system.