public void Reset()
{
envelope_counter = 0;
attack = 0;
decay = 0;
sustain = 0;
release = 0;
gate = 0;
rate_counter = 0;
exponential_counter = 0;
exponential_counter_period = 1;
state = State.RELEASE;
rate_period = rate_counter_period[release];
hold_zero = true;
}