Mi sinte preferido:
ZynAddSubFX is a opensource software synthesizer capable of making a countless number of instruments, from some common heared from expensive hardware to interesting sounds that you'll boost to an amazing universe of sounds.
The project started in March 2002, and I had written it because I wish to make a synthesizer that produces very beautiful sounds, but which is freely available to anybody who needs it.
Features of ZynAddSubFX:
- realtime synthesizer
- polyphonic (allows playing more than one note at once), mutlitimbral (allows playing more than one instrument at once) synth
- Microtonal capabilities with any scale, any number of notes per octave (well... the no. of notes per octave must be less than 128) and keymapping
- 3 synthesiser engines: 1) first (called "ADsynth" or "ADnote") is a complex engine which makes sounds by adding a number of voices. Each one has filters, envelopes, LFOs, morphing, modulation (Ring Modulation, Phase Modulation... the modulators can have any shape), resonance, etc. Each voice includes a very powerful waveform generator with up to 128 sine/nonsine harmonics. You can use Fourier synthesis or if you don't like it you can waveshaping/filtering of functions. This engine includes antialiasing.
2) second (called "SUBsynth" or "SUBnote") is a simpler engine who allows to make sounds by subtraction of harmonics of sounds from white noise
3) third (called "PADsynth" or "PADnote") is engine that makes very beautifull pads and other instruments.
- Instruments can be orgainzed in kits, which alows you to make drum kits or layered(mixed) instruments; this makes possible to use more than one instrument for a single part. It is possible to choose what items from the kit should be processed by the Part's effects.
- Effects: Reverb, Echo, Chorus/Flange, Phaser,AlienWah (it's a kind of vocal morpher), Distorsion(Waveshaping), EQ, DynamicFilter
- The effects can behave as System Effects or as Insertion Effects; this allows to use many effects at the same time. You can put any insertion effect on any part(or more insertion effects to same parts, if you like so) or you can put the insertion effect to Master output (very usefull if you use the EQ effect). Also, you can have instrument's effect (that is saved with the instrument).
- Filters up to 60dB/octave (or more..); filters can be analogic (LPF,HPF, BPF,etc.), formant(advanced formant filters) and state variable (SVF)
- Envelopes can have ADSR (or ASR, etc..) modes or can be free modes (with any shape)
- Many settings has a "randomness" option, which you can make instruments that every time produces a subtle different sound; this produces a very pleasent effect (like analogue synths or natural instruments that can't produces exactly same sound twice). Because of this, even if it is digital synthesis, it sounds "warm". Listen the ogg vorbis demos from this page to hear this effect.
- the specifications can be easily chaged, so (for example) if you want to change the number of voices or parts to a higher value or to allow a higher number of effects at the same time, there is necessary to chage only a single value from the source file (globals.h) and to recompile the program
- Intuitive and easy to use User Interface with Clipboard and many objects has user presets
- Midi support (supports many controllers) and (if you want) JACK support
- the program has Virtual Keyboard which let you to use it even if you don't have a real midi keyboard
- the graphical user interface can be completely disabled if the user need so
- it is a free program, licensed under version 2 of the GNU General Public License
- there are over 300 high quality instruments included into the package
- many other features.... It is is impossible to describe all this program's features in just a page
http://zynaddsubfx.sourceforge.net/
Se puede compilar como stand-alone o como plugin, pero yo no he conseguido hacer funcionar el plugin. Los motores de audio y midi se pueden configurar antes de compilar para elegir si se quiere usar alsa, oss, jack, portaudio... Lo normal es que en las distros de binarios venga compilado para jack (y puede que para oss simultaneamente).
¡Saludos!
comencemos 
