Hello Sluggo,
Generally speaking, the sfz format allows for much more articulation definitions that any other sample format, and in some sort, it will allow anything possible in any sample format.
To translate a particular library library, we need to know precisely what articulation effect is programmed on it though. I don't recall that functionality in Scarbee fingered (I have that one and the rsp73 in gig format here if that helps), but according to your description it sounds to me a typical 'keyboard switching' trick, very common nowadays. It was first introduced in Gigastudio like 10 years ago.
The trick consists in having separate set of samples mapped for the same group of notes, and then decide which one has to play according to what was the last key played within a special range, generally unused called 'keyswitch range'. In the case you mentioned, it looks like one set of samples will play if E0 was the last key played, and another different set of samples will play if C1 was the last key played.
This is very easy to program in the sfz format using the 'sw_last=' opcode. Here's how it works.
Let's say we have two regions mapped from C3 to C9, as follows:
<region> sample=CelloPizz.wav lokey=c3 hikey=c9
<region> sample=CelloEspr.wav lokey=c3 hikey=c9
If you play that sfz file, both regions will play together, layered, for any key from c3 to c9. Now, let's add some magic to that definition:
<region> sample=CelloPizz.wav lokey=c3 hikey=c9 sw_lokey=c2 sw_hikey=c#2 sw_last=c2
<region> sample=CelloEspr.wav lokey=c3 hikey=c9 sw_lokey=c2 sw_hikey=c#2 sw_last=c#2
We've added three opcodes to each region. The first two are used to define the 'keyswitch range', which is the area where our triggers live. That range can be anything, but it's more clear when any unused keyboard area is used, either below or above the standard range.
The third opcode is the trigger itself. Above example will play CelloPizz from c3 to c9, if the last key played in the keyswitch range was c2. CelloEspr will play from c3 to c9 if the last key played in the keyswitch range was c#2 instead. Using the <group> opcode, above example can be greatly simplified:
<group>
lokey=c3 hikey=c9 sw_lokey=c2 sw_hikey=c#2
<region> sample=CelloPizz.wav sw_last=c2
<region> sample=CelloEspr.wav sw_last=c#2
To use it, play c2 then the pizzicato part, then c#2 and the espressivo part. Naturally a single wav won't do the c3 to c9 range very well, this is just an example. Most likely many regions will share the c2/c#2 triggers.
As a more realistic example, I've used two existing mappings in Dimension to display the keyboard switching capabilities. Please get this small file, and extract it in your "$\Multisamples\15 - Strings\" folder. You can then load the file as a multisample (by clicking on the main display and finding it, or just drag&drop it into Dimension's GUI).
http://www.rgcstuff.com/External/keyswitch.zip The example is a combination of 1st violins, in Pizzicato and Espressivo. C4 activates the Pizzicato line, C#4 the espressivo line.
Creating this keyswitch took me a few minutes, just copy/paste plus adding the new opcodes. It would have taken ages in both of the major samplers
[/propaganda]
Hope this helps. Please forgive any mistake above text might have, I didn't have too much time for it.
-René