Carla is a fully-featured modular audio plugin host, with support for many audio drivers and plugin formats.
It has some nice features like transport control, automation of parameters via MIDI CC and remote control over OSC.

Carla currently supports LADSPA (including LRDF), DSSI, LV2, VST2, VST3 and AU plugin formats, plus SF2 and SFZ file support.
It uses JACK as the default and preferred audio driver but also supports native drivers like ALSA, DirectSound or CoreAudio.

There are 4 types of engine processing:

• Single-client: (JACK driver only)
  Same as Multi-client, except that all JACK ports belong to a single master client.
  This is needed when a setup doesn’t support multi-client JACK apps, such as LADISH.
• Multi-client: (JACK driver only)
  Ny plugin tsirairay dia miseho ho mpanjifa JACK vaovao. Ny seranana audio sy MIDI dia misoratra anarana raha ilaina.
• fitoeran'entana:
  Ny plugins dia karakaraina araka ny filaharany, hatrany ambony ka hatrany ambany.
  Ny plugins misy fantsona audio tsy stereo dia tsy tohanana, fa misy safidy stereo an-tery ho an'ny Mono.
• Patchbay:
  Modely patchbay modular, toy ny ao amin'ny JACK Multi-client sy ny fampiharana modular maro hafa.
  Ny plugin tsirairay dia mahazo vondrona canvas manokana sy seranana ahafahanao mampifandray audio sy MIDI plugin.