This synth is 'OpunlenZ'
It uses two wave forms and stacks a 7th, add 13, with arpeggio in octave going up in free mode.

Considerations about a 'digital' string.
The uses the Triple Oscillator with phase and amplitude modulators to get the sound.
This is a sample of the 'digital' string performing some basics.
The instrument is sensitive to the inputs of the device, and will remain active as long as an input is engaged.

Attached is a visualization from a multi input with a single input, the instrument is designed that it can be played to include the entire range of sound wave.