ZynAddSubFX

I'd really like to assign an LFO or an ADSR to some parameters (ie. LFO
speed or depth), like in many modern synths. Also, I think it would be
useful if it were possible to switch between current zyn behaviour
(modifications occur on the next note) and typical synth behaviour
(realtime adjustments). I'd like to see a polyphonic legato function (I'd
like to make chord progressions and have them "open up" gradually), and the
possibility of customizing legato behaviour (sometimes I'd like to reset
the filter at each note, but not the amplitude envelope, in order to keep
high attack and release time and make complicated riffs with a slow volume
increase, for example).