LSP Multiband Limiter

This plugin introduces a multiband limiter with flexible configuration. In most cases it acts as a brick-wall limiter but there are several settings for which is acts as an compressor with extreme settings, so the output signal may exceed the limiter's threshold. It prevents input monosignal from raising over the specified Threshold.

Attention: this plugin implements set of limiting modes, most of them are iterative. That means that CPU load may be not stable, in other words: the more work should be done, the more CPU resources will be used. Beware from extreme settings.

The gain reduction algorithm consists of four stages:

• Per frequency band automated level regulation.
• Per frequency band brickwall gain reduction.
• Per mix automated level regulation.
• Per mix band brickwall gain reduction.

That means that plugin provides per frequency band limiting algorithm and post-limiting after all frequency bands become summed together:

• Automated Level Regulation (ALR) acts like a compressor with infinite ratio for purpose of estimating the smoothed gain reduction level. The gain reduction level is controlled by the envelope of the signal applied to the compressor's gain reduction curve. The smoothness of the envelope is controlled by the Attack and Release knobs in the ALR section. Since different signals have different envelopes with short release time, the Knee knob allows to adjust the threshold of the compressor. Adjusting Knee may give possibility to gain some additional decibels of loudness in the final result.
• Peak cutting algorithm which searches peaks above the threshold values and applies short gain reduction patches to the signal. The form of patch is controlled by the Mode selector and it's length is controlled by the corresponding Attack and Release knobs. Note that Lookahead also affects these values: Attack can not be larger than Lookahead and Release can not be twice larger as Lookahead. Setting these values larger than allowed automatically makes them considered to be set to maximum possible values.