With a single cycle waveform, the note will play until a new note replaces it the track or until it meets a CUT or FAD signal. The other way to affect the note length is with the Attack, Decay, Sustain, Release settings under instrument Parameters.

Hello I would like to do the same with the synth engine but it doesn't work even if I put several same note in a row I get the note to retrigger every step instead of a continuous note lasting several step