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An audio stream chopping LV2 plugin.

Description: B.Choppr cuts the audio input stream into a repeated sequence of up to 16 chops. Each chop can be leveled up or down (gating). B.Choppr is the successor of B.Slizr.



a) Install the bchoppr package for your system

Note: This will NOT necessarily install the latest version of B.Choppr. The version provided depends on the packagers.

b) Use the latest provided binaries

Unpack the provided bchoppr-*.zip or bchoppr-*.tar.xz from the latest release and copy the BChoppr.lv2 folder to your lv2 directory (depending on your system settings, ~/.lv2/, /usr/lib/lv2/, /usr/local/lib/lv2/, or ...).

c) Build your own binaries in the following three steps.

Step 1: Download the latest published version of B.Choppr. Or clone or download the master of this repository.

Step 2: Install pkg-config and the development packages for x11, cairo, and lv2 if not done yet. If you don't have already got the build tools (compilers, make, libraries) then install them too.

On Debian-based systems you may run:

sudo apt-get install build-essential
sudo apt-get install pkg-config libx11-dev libcairo2-dev lv2-dev

On Arch-based systems you may run:

sudo pacman -S base-devel
sudo pacman -S pkg-config libx11 cairo lv2

Step 3: Building and installing into the default lv2 directory (/usr/local/lib/lv2/) is easy using make and make install. Simply call:

sudo make install

Optional: Standard make and make install parameters are supported. Alternatively, you may build a debugging version using make CXXFLAGS+=-g. For installation into an alternative directory (e.g., /usr/lib/lv2/), change the variable PREFIX while installing: sudo make install PREFIX=/usr. If you want to freely choose the install target directory, change the variable LV2DIR (e.g., make install LV2DIR=~/.lv2) or even define DESTDIR.

Optional: Further supported parameters include LANGUAGE (usually two letters code) to change the GUI language (see customize).


After the installation Ardour, Carla, and any other LV2 host should automatically detect B.Choppr.

If jalv is installed, you can also call it


to run it (pseudo) stand-alone and connect it to the JACK system.

Note: Jack transport is required to get information about beat / position


The plugin slices a stereo input stream, amplifies or silences the individual slices and send the whole sequence to the output. Although this affects only the audio signal, it needs a playback running (Jack transport).

In addition to the global controllers, the interface is divided into three parts: step controls, monitor and step shape.


  • Bypass : Bypass B.Choppr
  • Dry/wet : Dry / wet mixing

Step controls

  • Step markers : Defines the size of each step. Drag markers to relocate. Right click to switch between automatic and manual placement
  • Step level control : Sound level for each individual step
  • Sequences per bar : Number of sequences in one bar (1..8)
  • Amp swing : Sets all level sliders to a swing pattern (0.001 .. 1000.0). Values lower than 1 mean reduction of odd step level. Values higher than 1 mean reduction of even step level.
  • Steps swing : Sets all automatic markers to a swing pattern (1:3..3:1)
  • Auto markers : Sets all markers to automatic placement
  • Number of steps : Number of steps in one sequence (1..16)


  • On/Off switch : Switches monitor and monitor <-> plugin communication on/off. Reduces CPU load.
  • Monitor : Visualization (l + r signal) the input / output signal for a whole sequence. Use mouse wheel or drag to zoom in or out.

Step shape

  • Blend : Select between linear (for trapezoid shapes) and sinusoidal blend between the steps
  • Attack : Time (fraction of the respective step length) to increase the level at the begin of each step
  • Decay : Time (fraction of the respective step length) to decrease the level at the end of each step
  • Monitor : Visualization of a single step

🔗 Shared data

If you use multiple instances of B.Choppr you may be interested in sharing the plugin settings between the instances. Click on one of the four shared data fields and the respective plugin instance is linked to the shared data. The plugin instance data are copied to the shared data field if no other plugin instance is linked to this shared data field before (otherwise vise versa).

If you now click on the same shared data box in another plugin instance, both plugin instances get the same data.

Click again on the selected box to unlink the plugin instance from shared data. The plugin now shows the host-provided data.

Note: Shared data are unlinked from host automation.


You can create customized builds of B.Choppr using the parameter LANGUAGE (e.g., make LANGUAGE=DE). To create a new language pack, copy src/Locale_EN.hpp and edit the text for the respective definitions. But do not change or delete any definition symbol!

What's new

  • Faster
    • Optimized DSP code
    • Compiler optimizations (-O3 -ffast-math)
  • Presets, just a few
  • Binary compatibility improved
    • Static libs
    • Strip symbols by default
  • Binary packages provided


  • Thanks to LAM for translation