# Expander Stereo

Detailed: LSP Expander Stereo (E1S)

Formats: CLAP, GST, JACK, LADSPA, LV2, VST2, VST3

Categories: Expander

Developer: Vladimir Sadovnikov

Description:

This plugin performs increasing of dynamic range of stereo input signal. Flexible sidechain-control configuration isprovided. Both downward and upward modes are available. Also additional dry/wet control allows to mix processed and unprocessed signal together.

Additionally, Stereo split mode allows to apply processing to the left and right channels independently while keeping the same settings for the left and right channels.

Controls:

- Bypass - bypass switch, when turned on (led indicator is shining), the plugin bypasses signal.
- Pause - pauses any updates of the expander graph.
- Clear - clears all graphs.
- Stereo Split - enables independent processing of left and right channels.
- Gain L, R - enables drawing of gain amplification line and corresponding amplification meter.
- SC L, R - enables drawing of sidechain input graph and corresponding level meter.
- Env L, R - enables drawing of expander's envelope graph and corresponding level meter.
- In L, R - enables drawing of expander's input signal graph and corresponding level meter.
- Out L, R - enables drawing of expander's output signal graph and corresponding level meter.
- Link - the name of the shared memory link to pass sidechain signal.
- Pre-mix - shows pre-mix control overlay.
- Sidechain - shows the sidechain control overlay.
- Mix - shows the Dry/Wet control overlay.

'Expander' section:

- Mode - expander mode: Up (upward) or Down (downward).
- Ratio - expander ratio.
- Knee - size of the knee.
- Makeup - additional amplification gain after processing stage.
- Attack Level - threshold of the expander, placed in the middle of the knee.
- Attack Time - attack time of the expander.
- Release Level - relative to the Attack Level threshold that sets up the threshold of Release Time.
- Release Time - release time of the expander.
- Hold - the time period the envelope holds it's maximum value before starting the release.

'Signal' section:

- Input - overall input gain.
- Output - overall output gain.

Pre-mix control overlay:

- In -> Link - the amount of signal from input channel added to the shared memory link.
- Link -> In - the amount of signal from shared memory link added to the input channel.
- Link -> SC - the amount of signal from shared memory link added to the sidechain channel.

Sidechain control overlay:

- Preamp - pre-amplification of the sidechain signal.
- Reactivity - reactivity of the sidechain signal.
- Lookahead - look-ahead time of the sidechain relative to the input signal.
- Setup - Sidechain configuration, available values:

- Internal - sidechain input is connected to expander's input.
- Link - sidechain input is passed by shared memory link.
- Peak - peak mode.
- RMS - Root Mean Square (SMA) of the input signal.
- LPF - input signal processed by recursive 1-pole Low-Pass Filter (LPF).
- SMA - input signal processed by Simple Moving Average (SMA) filter.
- Middle - middle part of signal is used for sidechain processing.
- Side - side part of signal is used for sidechain processing.
- Left - only left channel is used for sidechain processing.
- Right - only right channel is used for sidechain processing.
- Min - the absolute minimum value is taken from stereo input.
- Max - the absolute maximum value is taken from stereo input.
- Left/Right - left and right channels are being processed using respectively the left and right sidechain channels in stereo split mode.
- Right/Left - left and right channels are being processed using respectively the right and left sidechain channels in stereo split mode.
- Mid/Side - left and right channels are being processed using respectively the middle and side parts of sidechain signal in stereo split mode.
- Side/Mid - left and right channels are being processed using respectively the side and middle parts of sidechain signal in stereo split mode.

- Listen - allows to listen the processed sidechain signal.
- LPF - allows to set up slope and cut-off frequency for the low-pass filter applied to sidechain signal.
- HPF - allows to set up slope and cut-off frequency for the high-pass filter applied to sidechain signal.

Dry/Wet mix control overlay:

- Mix Dry - the amount of dry (unprocessed) signal.
- Mix Wet - the amount of wet (processed) signal.
- Mix Dry/Wet - the knob that controls this balance between mixed dry and wet signal (see Mix Dry and Mix Wet) and the dry (unprocessed) signal.