Basically, a line in the definition.txt (perhaps defaulted by the %%parameters) describing the way the wav's should be processed is a soundfont.
Packages can use soundfonts with other formats like the SFZ format used by the popular SF2 samplesets
or proprietary formats like used by the GrandOrgue sample sets (usually high quality and easily extractable)
and commercial sample sets in the protected Native Instruments Kontakt nki/nkm format.
Despite the soundfont differences, most of the sample sets have the needed wav's stored in them in the directory structure,
so it's a matter of getting the right wav's out and write the definition statements.
Sometimes this is not possible (e.g. gig/nki/nkm), tough, write your congressman.
Usually they already have the loop markers - count your blessings as this can be a tedious job.
Some may even have release samples defined, however it's a challenge to get the %xfade.. parameters properly tuned.
Bottom line: you can find lots of good wav collections - or sound font sets where you can just copy the wav's from the sample set or have to perform a small conversion (SF2)
... or need the utilities with your commercial product to get them out. I collected some links on the bottom of this page.
If you want to extract WAV files from an SF2, here is a way to start:
piano/%notename.wav,%velocity=0 forte/%notename.wav,%velocity=64Now here is exactly the same definition file in .sfz format:
// Dynamic: piano (normal)As I really want something fast (a sample-set should be done in 2 minutes, not more), I don't want to support these very verbose formats, for which you need a third-party software to write definition files.lovel=0 hivel=63 pitch_keycenter=57 lokey=57 hikey=57 sample=/Instruments/Banjo/piano/A3.wav pitch_keycenter=69 lokey=69 hikey=69 sample=/Instruments/Banjo/piano/A4.wav pitch_keycenter=81 lokey=81 hikey=81 sample=/Instruments/Banjo/piano/A5.wav pitch_keycenter=58 lokey=58 hikey=58 sample=/Instruments/Banjo/piano/A#3.wav pitch_keycenter=70 lokey=70 hikey=70 sample=/Instruments/Banjo/piano/A#4.wav pitch_keycenter=82 lokey=82 hikey=82 sample=/Instruments/Banjo/piano/A#5.wav pitch_keycenter=59 lokey=59 hikey=59 sample=/Instruments/Banjo/piano/B3.wav pitch_keycenter=71 lokey=71 hikey=71 sample=/Instruments/Banjo/piano/B4.wav pitch_keycenter=83 lokey=83 hikey=83 sample=/Instruments/Banjo/piano/B5.wav pitch_keycenter=48 lokey=48 hikey=48 sample=/Instruments/Banjo/piano/C3.wav pitch_keycenter=60 lokey=60 hikey=60 sample=/Instruments/Banjo/piano/C4.wav pitch_keycenter=72 lokey=72 hikey=72 sample=/Instruments/Banjo/piano/C5.wav pitch_keycenter=49 lokey=49 hikey=49 sample=/Instruments/Banjo/piano/C#3.wav pitch_keycenter=61 lokey=61 hikey=61 sample=/Instruments/Banjo/piano/C#4.wav pitch_keycenter=50 lokey=50 hikey=50 sample=/Instruments/Banjo/piano/D3.wav pitch_keycenter=62 lokey=62 hikey=62 sample=/Instruments/Banjo/piano/D4.wav pitch_keycenter=74 lokey=74 hikey=74 sample=/Instruments/Banjo/piano/D5.wav pitch_keycenter=51 lokey=51 hikey=51 sample=/Instruments/Banjo/piano/D#3.wav pitch_keycenter=63 lokey=63 hikey=63 sample=/Instruments/Banjo/piano/D#4.wav pitch_keycenter=75 lokey=75 hikey=75 sample=/Instruments/Banjo/piano/D#5.wav pitch_keycenter=52 lokey=52 hikey=52 sample=/Instruments/Banjo/piano/E3.wav pitch_keycenter=64 lokey=64 hikey=64 sample=/Instruments/Banjo/piano/E4.wav pitch_keycenter=76 lokey=76 hikey=76 sample=/Instruments/Banjo/piano/E5.wav pitch_keycenter=53 lokey=53 hikey=53 sample=/Instruments/Banjo/piano/F3.wav pitch_keycenter=65 lokey=65 hikey=65 sample=/Instruments/Banjo/piano/F4.wav pitch_keycenter=77 lokey=77 hikey=77 sample=/Instruments/Banjo/piano/F5.wav pitch_keycenter=54 lokey=54 hikey=54 sample=/Instruments/Banjo/piano/F#3.wav pitch_keycenter=66 lokey=66 hikey=66 sample=/Instruments/Banjo/piano/F#4.wav pitch_keycenter=78 lokey=78 hikey=78 sample=/Instruments/Banjo/piano/F#5.wav pitch_keycenter=55 lokey=55 hikey=55 sample=/Instruments/Banjo/piano/G3.wav pitch_keycenter=67 lokey=67 hikey=67 sample=/Instruments/Banjo/piano/G4.wav pitch_keycenter=79 lokey=79 hikey=79 sample=/Instruments/Banjo/piano/G5.wav pitch_keycenter=56 lokey=56 hikey=56 sample=/Instruments/Banjo/piano/G#3.wav pitch_keycenter=68 lokey=68 hikey=68 sample=/Instruments/Banjo/piano/G#4.wav pitch_keycenter=80 lokey=80 hikey=80 sample=/Instruments/Banjo/piano/G#5.wav // Dynamic: forte (normal) lovel=64 hivel=127 pitch_keycenter=57 lokey=57 hikey=57 sample=/Instruments/Banjo/forte/A3.wav pitch_keycenter=69 lokey=69 hikey=69 sample=/Instruments/Banjo/forte/A4.wav pitch_keycenter=81 lokey=81 hikey=81 sample=/Instruments/Banjo/forte/A5.wav pitch_keycenter=58 lokey=58 hikey=58 sample=/Instruments/Banjo/forte/A#3.wav pitch_keycenter=70 lokey=70 hikey=70 sample=/Instruments/Banjo/forte/A#4.wav pitch_keycenter=82 lokey=82 hikey=82 sample=/Instruments/Banjo/forte/A#5.wav pitch_keycenter=59 lokey=59 hikey=59 sample=/Instruments/Banjo/forte/B3.wav pitch_keycenter=71 lokey=71 hikey=71 sample=/Instruments/Banjo/forte/B4.wav pitch_keycenter=83 lokey=83 hikey=83 sample=/Instruments/Banjo/forte/B5.wav pitch_keycenter=48 lokey=48 hikey=48 sample=/Instruments/Banjo/forte/C3.wav pitch_keycenter=60 lokey=60 hikey=60 sample=/Instruments/Banjo/forte/C4.wav pitch_keycenter=72 lokey=72 hikey=72 sample=/Instruments/Banjo/forte/C5.wav pitch_keycenter=84 lokey=84 hikey=84 sample=/Instruments/Banjo/forte/C6.wav pitch_keycenter=49 lokey=49 hikey=49 sample=/Instruments/Banjo/forte/C#3.wav pitch_keycenter=61 lokey=61 hikey=61 sample=/Instruments/Banjo/forte/C#4.wav pitch_keycenter=73 lokey=73 hikey=73 sample=/Instruments/Banjo/forte/C#5.wav pitch_keycenter=85 lokey=85 hikey=85 sample=/Instruments/Banjo/forte/C#6.wav pitch_keycenter=50 lokey=50 hikey=50 sample=/Instruments/Banjo/forte/D3.wav pitch_keycenter=62 lokey=62 hikey=62 sample=/Instruments/Banjo/forte/D4.wav pitch_keycenter=74 lokey=74 hikey=74 sample=/Instruments/Banjo/forte/D5.wav pitch_keycenter=86 lokey=86 hikey=86 sample=/Instruments/Banjo/forte/D6.wav pitch_keycenter=51 lokey=51 hikey=51 sample=/Instruments/Banjo/forte/D#3.wav pitch_keycenter=63 lokey=63 hikey=63 sample=/Instruments/Banjo/forte/D#4.wav pitch_keycenter=75 lokey=75 hikey=75 sample=/Instruments/Banjo/forte/D#5.wav pitch_keycenter=87 lokey=87 hikey=87 sample=/Instruments/Banjo/forte/D#6.wav pitch_keycenter=52 lokey=52 hikey=52 sample=/Instruments/Banjo/forte/E3.wav pitch_keycenter=64 lokey=64 hikey=64 sample=/Instruments/Banjo/forte/E4.wav pitch_keycenter=76 lokey=76 hikey=76 sample=/Instruments/Banjo/forte/E5.wav pitch_keycenter=88 lokey=88 hikey=88 sample=/Instruments/Banjo/forte/E6.wav pitch_keycenter=53 lokey=53 hikey=53 sample=/Instruments/Banjo/forte/F3.wav pitch_keycenter=65 lokey=65 hikey=65 sample=/Instruments/Banjo/forte/F4.wav pitch_keycenter=77 lokey=77 hikey=77 sample=/Instruments/Banjo/forte/F5.wav pitch_keycenter=54 lokey=54 hikey=54 sample=/Instruments/Banjo/forte/F#3.wav pitch_keycenter=66 lokey=66 hikey=66 sample=/Instruments/Banjo/forte/F#4.wav pitch_keycenter=78 lokey=78 hikey=78 sample=/Instruments/Banjo/forte/F#5.wav pitch_keycenter=55 lokey=55 hikey=55 sample=/Instruments/Banjo/forte/G3.wav pitch_keycenter=79 lokey=79 hikey=79 sample=/Instruments/Banjo/forte/G5.wav pitch_keycenter=56 lokey=56 hikey=56 sample=/Instruments/Banjo/forte/G#3.wav pitch_keycenter=68 lokey=68 hikey=68 sample=/Instruments/Banjo/forte/G#4.wav
In the you'll find a samples directory with a few sample sets.
But a search engine is your best friend......really...
And please do interesting findings.
For a start some general/index sites.