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)
  Yonke iplagin enye ivezwa njengomthengi omtsha we-JACK. Amazibuko omsindo kunye ne-MIDI abhalisiwe njengoko kufuneka.
• Irakhi:
  Iiplagi zicutshungulwa ngokulandelelana, ukusuka phezulu ukuya ezantsi.
  Iiplagi ezinamatshaneli omsindo angeyo-stereo azixhaswanga, kodwa ukhetho lokunyanzeliswa kwestereo luyafumaneka kwiMono.
• ePatchbay:
  Imowudi ye-patchbay yemodyuli, njengakwi-JACK Umxumi omninzi kunye nezinye ezininzi usetyenziso lweemodyuli.
  Yonke i-plugin ifumana iqela layo le-canvas kunye namazibuko akuvumela ukuba udibanise i-plugin audio kunye ne-MIDI.