Acustica IVORY5, Manual

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2.4. What is a “ZL” plug-in?
Acustica plugins come in two versions: ZL (zero latency) and a regular version. While the ZL
version does not introduce any latency to your system, the standard version does.
This buffer varies in size for each plugin and helps reduce the CPU and system load of your
computer significantly. We recommend that you use a ZL instance when tracking.
Basically, both plugin instances are identical, but the current Acqua engine can work either
with or without an audio buffer. The idea behind a ZL instance is to give you the option to
run an Acqua Effect with minimal latency, which is useful for tracking or direct monitoring.