I had intended to use my Fluxamasynth as tool to create 'ambient drones' but now I'm wondering if this is possible

It seems as though the sounds the play (any tonal instrument) decay on their own after about 6 seconds or so even if i have not turned the note off or adjusted the volume.
Does anyone know if it's possible to sustain any of the sounds indefinitely (as if I were holding a key down on a synthesizer)?
Here's an example sketch showing that the sound decays on it's own after about 6s even though the note is on for 20s:
Code: Select all
#include <Fluxamasynth.h>
Fluxamasynth synth;
byte instrument = 0;
void setup() {
synth.setMasterVolume(255);
}
void loop()
{
for (int note=60; note<85; note++) {
synth.noteOn(0, note, 100);
delay(20000);
synth.noteOn(0, note, 0); // Be sure to turn the note off!
}
}