There is a group of us working to translate the Kontakt-only instruments into SFZ format which can be used with the free Sforzando player. https://www.plogue.com/products/sforzando.html
Some are on the site, some are here: https://github.com/sfzinstruments/mappings/tree/master/Pianobook%20SFZ
I just finished the Gentle Vibes SFZ version and uploaded it, and at your request I have done the ST HELEN CLARINET PAD. However, it takes some time between uploading and it appearing on the site.
If you don’t want to wait, the code is below. Paste it into a pure text file:
/*
Title: St. Helen's Clarinet Pad
Instrument: A clarinet and a viola combined into a blended pad.
This instrument is the perfect example of two instruments, lacking that special
something by themselves, coming together to form a beautiful whole.
Home
http://www.sfzformat.com/
https://plogue.com/products/sforzando.html
Recorded by: Ash Verjee https://www.pianobook.co.uk/author/ash-verjee/
Terms of Use: https://www.pianobook.co.uk/terms
Published on: Dec 10, 2020
===========================================
SFZ by Sid
Place this SFZ file in the folder outside of the Samples folder.
*/
// Pianobook MVP SFZ Template V 1.0
<control>
default_path=St. Helen's Clarinet Pad Samples/
label_cc007=Master Volume
label_cc010=Master Pan
label_cc074=Brightness
label_cc064=Sustain
label_cc020=Viola Vol
label_cc021=Clarinet Vol
set_cc074=127
<global>
amplitude_oncc7=100
pan=50
pan_oncc10=200
ampeg_attack=0.005
ampeg_decay=0
ampeg_sustain=100
ampeg_release=1
ampeg_hold=0
ampeg_delay=0
offset=0
note_polyphony=2
note_selfmask=off
// soft piano style
fil_type=lpf_2p
cutoff=200
cutoff_cc074=9600
//===========================================================================
<group>
group=1
group_label=Viola
lovel=0
hivel=127
locc20=1 hicc20=127
xfin_locc20=1
xfin_hicc20=127
<region>
sample=Tape Viola with Reverb.wav
hikey=100
lokey=0
pitch_keycenter=G#4
//===================================================================
<group>
group=2
group_label=Clarinet
lovel=0
hivel=127
locc21=1 hicc21=127
xfin_locc21=1
xfin_hicc21=127
<region>
sample=D3.wav
hikey=D3
lokey=0
pitch_keycenter=D3
<region>
sample=A3.wav
hikey=A3
lokey=D#3
pitch_keycenter=A3
<region>
sample=E4.wav
hikey=E4
lokey=A#3
pitch_keycenter=E4
<region>
sample=B4.wav
hikey=B4
lokey=E#4
pitch_keycenter=B4
<region>
sample=F#5.wav
hikey=100
lokey=C4
pitch_keycenter=F#5