The 4.9.0 is out! New features:

csound-expression

• Functions for creation of FM-synthesizers. We can create
  the whole graph of FM-units (with feedback). Check out the module Csound.Air.Fm

• Support for Monosynth patches. See atMono in the module Csound.Air.Patch
  see the function atMono and atMonoSharp.

• Easy to use Binaural panning. See the module Csound.Air.Pan
  It’s like:

headPan :: (Sig, Sig) -> Sig -> Sig2
headPan (azimuth, elevation) asig = (aleft, aright)

the compiler can supply the right extra files by reading the header of .csd

• Construction of patches for sound fonts (sfPatch, sfPatchHall).

• Table of tables. We can create a table that contains tables.

• Harmonic oscillators for subtractive synth: buz and gbuz
  (the functions are adapted from the Csound ones)

• Reverbs for patches. It’s very easy to add a reverb to your patch
  (withSmallHall patch, withLargeHall patch, etc)

• Some bug-fixes

csound-catalog

• Many mono-synth were added. You can use them with function atMono
  in place of atMidi. The mono versions of patches have suffix m.
  Like hammonOrganm or nightPadm. We can use it like this:

> dac $ atMono nightPadm

• SHARC instruments. SHARC db contains a FFT-samples for sustain notes.
  It includes many orchestra instruments. There are many new patches that
  use natural sounding timbres taken from the SHARC library.
  Check out functions soloSharc, padSharc, dreamSharc.

We can use it like this:

> dac $ atMidi $ padSharc shCello

csound-sampler

• Handy function withBpm allows to query current bpm with in the scope
  of expression.

• Sampler mappers were generalized.

• Char trigering functions are synchronized with bpm.

Cheers!
Anton