Logic Pro X

Wow, 14 gig download with 3000 presets. That's 2000 more than 1.55 :)

Edit: from createdigitalmusic.com

A new Alchemy
It’s not just Alchemy inside Logic Pro X 10.2. This is officially Alchemy 2.0, a major update. For those of you familiar with the instrument, here’s some of what’s new:
Better morphing. Advanced cross-synthesis now improves audio morphing, incorporating all the details of the sound (additive, spectral, formant, pitch, envelope). You also get more options in the interface.
More precise additive resynthesis, spectral resynthesis. These are really a big part of what sets Alchemy apart, and they’re vastly expanded. There are more additive effects (Pulse/Saw, Harmonic, Beating, Stretch, Shift, Magnet, Spread, Auto Pan). And you get more precise control of both additive and spectral resynthesis – the algorithms themselves have been sonically improved, we’re told. And there’s a new partial tracker, you have more editing options, and you can see everything you’re doing via real-time spectrogram. Spectral resynthesis also works in stereo now, as well, and supports masking.
Powerful formant and granular modes. Loads of depth here, too, including elaborate controls for formant resynthesis (with multiple filter shapes), and multi-tap granular controls you can space out across a stereo field.
Added pitch correction. Correct pitch to unison, octave, fifth, a combination of fifth/octave, or chromatically, with adjustments for amount and speed.
Use the sampler with EXS24. You can now import Logic’s EXS24 sampler instruments directly into the Alchemy sampler, meaning access to Logic’s own library and lots of third-party content. The Sampler module itself is also more powerful, with a reverse mode, automatic keymapping, and new keymap editor and group editor.
Bring the noise. The virtual analog side of things is expanded, too – sync, anti-aliased PWM, waveform shape display, and a noise section with 13 noise types (not just white and pink).
New filters. These are all-new, with both enhanced comb filters, and redesigned analog filter emulations, plus added “Bee,” FM, Compressor, LP10 and HP10 modes.
Modulation and arpeggiators that are kind of insane. Alchemy adds per-source arpeggiators and reorganized editors for source controls and the arpeggiator. And you can modulate all kinds of things. You can switch patterns with modulation (yipes, one-note presets, anyone?), modulate the rate knob, modulate keyswitches, and see visual feedback in real-time.
Envelopes with more power. You get graphical AHDSR with tempo sync. And there are envelope followers at eight points in the signal chain.
More samples and easier browsing. Alchemy now has 3100 presets plus 300 Logic patches, and a 14 GB sample library. (Fortunately, that sample library is an optional download from the store, just like other extended Logic content.) To navigate all of the included content or manage your own sounds, there’s a redesigned browser with expanded drag-and-drop support.
Dial-in controls if you want to improvise / don’t want to get too deep. Alchemy’s X/Y pads and transforms already resembled Apple’s own work on making Smart Controls. The idea: give people a few knobs to dial up variations on much deeper sound engines. So, little surprise here: Alchemy will be fully integrated in the Logic interface, which means access from those Smart Controls and the accompanying iPad app remote.
But it’s more efficient. Apple says they’ve reduced CPU usage.
- and you shouldn’t lose your old presets. Existing presets are available in the install, and third-party presets should (mostly) compatible. The 1.5 file format can be imported into Alchemy, and while some internal engine changes may mean some things don’t work identically, you should be able to load your existing collections.