KaStro is an implementation of Karplus-Strong synthesis concept. It consists of an exciter - short noise burst and resonator which is a chain of tuned echoes with feedback path and some filtering around. Filters are configured by ear, not trying to mimic any particular instrument. In fact it was quite fiddly to find useful sweet spots.
This release has no parameters except tone color which is controlled by velocity - lower values are closing the filter of the noise exciter.
Musically useful are octaves between C3 and C7. Lowest and highest registers are prone to feedback and might stall SunVox'es output but they shouldn't blow your speakers as there's a limiter at the end of the chain.
Here's the demo of the patch.
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