CAIN++ is a user oscillator to emulate plucked string instruments using the Karplus/Strong approach. Since the parameters are not absolutely intuitive, here are some hints by the author for a couple of patches:

C++lavinet
Shape: Max
Shift Shape: Max
Pluck: 1
S Volume: 1
S Color: 1
Frequenzy: 20
Waveform: 1

C++Guitar
Shape: Max
Shift Shape: Max
Pluck: 43
S Volume: 1
S Color: 1
Frequenzy: 20
Waveform: 1

Soft C++ Bass
Shape: Max
Shift Shape: Max
Pluck: 98
S Volume: 32
S Color: 100
Frequenzy: 41
Waveform: 1