Here’s a 6 voice physical modeling synth in a small pedal. You can connect a MIDI keyboard and just have at it.
Ghosts from Kinotone
It also does a lot of other things ( reverb, granular processing, microtonal chords, frequency shifting, looping, dot dot dot ) but here are the features relevant to this thread :
Physical Modeling Engine
- 6-voice polyphony
- Excite the resonators with external audio, the built-in contact mic, or MIDI notes
- Flexible, high-fidelity physical models: strings, tubes, bars
- Reharmonize the resonators with 12 preset chords
- Selectable root note and chord voicing
Polyphonic MIDI instrument
- Retune the resonator voices directly via keyboard control
- Internal exciter turns Ghosts into a playable physical modeling instrument
- Multiple MIDI exciters: pluck, strike, blow — or create your own exciter with a captured loop
I guess it gets classified as Karplus Strong ( ? )