I don't know where the manuals are (i can't find mine either) but there are some differences.
In my opinion, Rapture is more powerful than Dim Pro, in that you can create more sounds with Rapture, and have more options. By that i mean if you have both programs because Dim Pro's libery is much bigger.
There's probabaly some i might miss off the top of my head, but;
Rapture has 2 extra elements. You can multiply and detune (some of) the waveforms, and ring mod (some of) the waveforms in Rapture. Rapture has the DSP block which features extra 'distortion units' and routing possibilities, aswell as an extra filter.
You can sync Rapture's envelopes to the host tempo, and 'snap to grid' the nodes (by clicking anywhere in the envelope section and pressing P on your computer's keyboard.) Then you can adjust the tempo of the envelope with the sync control and the envelope stays in time.
Rapture has step sequencers, Dim Pro doesn't. Rapture has a Global page, featuring 2 step sequencers - one for the left, and one for the right channels. The global page also has 2 global fx, a master fx unit, and a master eq unit.
There isn't really anything that Dim Pro can do that Rapture can't. However, Dim Pro comes with Samples, and Rapture comes with Wavetables. The only reason you'd use Dim Pro if you have Rapture would be to use it's (excellent) presets.
Most of Dim Pro's presets are single element SFZ files, or wav samples, both of which Rapture can handle. So i load the actual sfz (or wav) files into Rapture rather than load the Program into Dim Pro. That way i have much more control over the final sound if i want to change it.
I'm sure i've missed something but if i remember i'll edit this.
post edited by S.Wallis - 2010/10/17 09:24:39