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> Carla 2.0 beta4 is here!
On 2015-03-18 by falkTX

Hello again everyone, we're glad to bring you the 4th beta of the upcoming Carla 2.0 release.
This release is mostly focused on bug-fixing, so there aren't many splashy new features to show compared to previous ones.
Still, here's the highlights:



Updated plugin skins

The plugin skins received some updates once again.
They can now be collapsed in order to take less space.
More to come soon.


New experimental plugins

Some of the best linux-standalone tools are now working as internal Carla plugins.
And because Carla exports its internal plugins as LV2, you'll also get them as LV2.
Note that this is still experimental!
Also, there's no support whatsoever from the original authors...


MOD GUI Support

Carla can now show LV2 MOD GUIs, handled like a regular LV2 UI type.
Note that this only works on the right setups (you need MOD-UI to be working first).
It's not available on pre-compiled binaries, but you can get it via the KXStudio repositories.

More changes

  • LinuxSampler code has been reworked and it's working better, it now exposes 2 output parameters.
  • The plugin bridge code has been reworked; bridges are much more stable and MIDI-out is working.
  • NSM code has also been reworked, testers welcome.
  • OSC ports can be static by using CARLA_OSC_TCP_PORT and CARLA_OSC_UDP_PORT environment variables.
  • Time panel can be shown/hidden as needed.
  • DISTRHO-based internal plugins are back, specifically 3BandEQ/Splitter, PingPongPan, Nekobi, MVerb, VectorJuice and WoobleJuice.
  • carla-single script is back, allowing you to quickly test and run all plugins.
  • Carla as plugin allows new, open and save-as (export) menu actions.
  • Start of new midi-sequencer plugin, still experimental and Linux-only for now.
  • MIDI file internal plugin now saves the contents, so you can share projects without worrying if the file exists on the other system.
  • Added 6 basic parameters to the ZynAddSubFX internal plugin.
  • New MIDI channel filter plugin.
  • LV2 and AU plugins are cached and automatically updated when needed, no need for scanning.
  • Patchbay mode is now working for non-JACK drivers.
  • Carla saves internal and external connections, specially useful in patchbay mode.
  • Lots and lots of bug fixes.

Special Notes

  • Renaming plugins currently is not safe (unless using Rack mode).
  • GIG/SF2/SFZ skin still to be done, and some others...
  • Plugin bridges only work on Linux right now. They used to be working for OSX but stopped due to a OS limitation.
  • Windows 64bit builds a shows small console windows when discovering plugins. This is not intended and will hopefully be fixed soon.


To download Carla binaries or source code, jump into the KXStudio downloads section.
If you're using the KXStudio repositories, you can simply install "carla-git" instead (plus "carla-lv2" and "carla-vst" if you're so inclined).
Bug reports and feature requests are welcome! Jump into the Carla's GitHub project page for those.

> Carla 2.0 beta3 is here!
On 2014-10-25 by falkTX

Hello again everyone, we're glad to bring to you the 3rd beta of the upcoming Carla 2.0 release.
There have been quite a few nice features implemented since beta2; here are the highlights.



Internal Patchbay

This new engine processing mode is similar to what JACK does for all clients and what other modular applications do.
Every plugin gets its own canvas group and ports allowing you to interconnect plugin audio and MIDI.
You can use this mode to build complex plugin routing scenarios, perhaps involving several layers of rack and patchbays.

Note that this is currently not available for non-JACK drivers; but for those you can use the internal carla-patchbay plugin.
There's no support for LV2 Control-Voltage ports as of yet, this will be implemented in the next beta together with MIDI-OSC.


Carla as VST plugin (Linux only)

With the first beta of Carla 2.0 we introduced Carla as a plugin, which worked as both internal and LV2.
Now Carla is available as a VST plugin too, allowing you to load it all DAWs released for Linux.
There are 4 variants: Rack-Synth, Rack-FX, Patchbay-Synth and Patchbay-FX.


Carla LMMS Plugin

Carla has an LMMS plugin too, as Carla-Patchbay and Carla-Rack instruments.
So finally you can use native softsynths within LMMS!
The carla-lmms plugin code is already in LMMS and will be part of its 1.1 release.

If you're using the KXStudio repositories and feel like giving it a try simply install carla-git and lmms.


AU Plugins (MacOS only)

AU plugins are working in Carla now.
Carla's plugin compatibility increases once more.


New and updated skins

There's a new OpenAV-style plugin slot skin.
Calf and ZynFX have been updated.
More to come soon.


Old non-skin mode

You can now use the old non-skin mode from Carla 1.x series.
This saves space if you load lots of plugins at once.

More stuff

  • New time panel added, but it's very incomplete.
  • LV2 plugin discovery is now automatic, but without plugin checks or testing.
  • LV2 plugins are fully working on MacOS and Windows, including their native UIs (Cocoa and HWND respectively).

There will still be 1 or 2 more beta releases before going for a release candidate, so expect more cool stuff soon!


To download Carla binaries or source code, jump into the KXStudio downloads section.
If you're using the KXStudio repositories, you can simply install "carla-git" instead (plus "carla-lv2" and "carla-vst" if you're so inclined).
Bug reports and feature requests are welcome! Jump into the Carla's Github project page for those.

> DISTRHO: New plugins and minor fixing
On 2014-08-27 by falkTX

In this release we bring 4 new Linux plugin ports:
- EasySSP
- LUFS Meter
- Luftikus
- Stereo Source Separator
(Go to to see the current list of Linux ports.)

The DPF-based plugins also had some minor fixes:
- 3BandEQ/Splitter had its sliders inverted, now fixed
- ProM now has pre-compiled linux binaries; UI can be resized by using - and + keys
- MVerb knobs order has been fixed
- Allow to open UI in LV2 hosts that don't support options feature (Ingen)
- Workaround for some VST hosts that don't set sample rate during init (Ardour3 and energyXT)

> The 2nd beta of Carla 2.0 is here!
On 2014-08-15 by falkTX

The Carla Plugin Host 2.0 beta2 release is finally here!
This release was slightly delayed in order to ensure plugin bridges were working properly.
If you haven't heard about the Carla 2.x series do so here.

In short, this release makes plugin bridges actually work and it's the first to support MacOS (>= 10.6).
The backend is now completely toolkit agnostic, only depending on the native window system (like X11 on Linux).
This release is much more stable when compared to the previous beta - it will no longer eat your cat! ;)
It should already be good enough for regular usage, if you can ignore some incomplete UI things.

Known issues / Release notes: (all to be fixed in the next beta)

  • All DPF and JUCE-based internal plugins were removed to reduce code size and complexity, they will be re-introduced later
  • AU plugin support is available on MacOS, but the discovery mechanism fails to find them
  • Linux release has support for bridging Window plugins using Wine (32bit and 64bit).
  • Linux 32bit release will not load 64bit plugins even if ran on a 64bit system
  • MacOS Carla-Rack LV2 plugin fails to show UI
  • MacOS and Windows do not support native widgets in LV2 yet (Cocoa and HWND, respectively)
  • MacOS release is 64bit only but it can load 32bit plugins
  • Windows 64bit build doesn't provide GIG and SFZ support, use the 32bit build if you need those
  • Windows builds do not support bridges (ie, 32bit plugins on a 64bit Carla) or Carla as plugin

The next beta will change a few things, specially UI-wise.
The discovery mechanism needs to be reworked for AU support and faster LV2 access.
Adding plugins and browsing presets will probably change too.
LMMS and VST plugin versions of Carla-Rack are also planned, but no promises for these.
We'll be posting more news as things are developed.

> DISTRHO New release pack (2014-07-16)
On 2014-07-16 by falkTX

DISTRHO has a new release!

In this release we cleaned up all the plugins, added new ones and removed those that we not considered good enough.
Standalones are no longer available. Highlife was removed as a requested by its authors.

The plugins we added to Ports are:

  • Dexed
  • KlangFalter
  • MVerb
  • Nekobi
  • Obxd
  • PitchedDelay

Additionally we made a new plugin - ProM - a music visualizer as audio plugin based on projectm.

See the plugins and ports sections on DISTRHO's website for screenshots and downloads.
The complete source code is available at

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