Q: what is attack, decay, sustain and release?
A: attack is how quickly the note starts. so if 'attack' is set all the way short, the note starts immediately when you press the note. if 'attack' is set to a longer setting, the note will gradually fade in when you press the note. Decay is what happens to the note when you keep holding it down. very short decay means the note will drop off to silence immediately, even if you are holding it down. longer decay means it will fade out very very slowly as you hold it down, or maybe even never fade. release is what happens to the note after you let go. short release means the note disappears instantly when you let go. long release means it lingers after you let go, and fades slowly, or even if you set the release to maximum, it will probably stay forever. Sustain is an additional bonus option. instead of "decay" decaying to 0 volume, you can set 'sustain' at a certain level and that will be the volume level that it decays to while you are still holding the note down. then when you let go, the 'release' happens from there. so for example, if you set all 4 sliders (attack, decay, sustain, release) to "medium", and you press your note and hold it, the note will fade in at a medium pace, then drop down at a medium pace to a medium level. then when you let go it will drop to silence at a medium pace. i hope that makes sense