void OPL_KEYOFF(OPL_SLOT SLOT)
{
if (SLOT.evm > ENV_MOD_RR)
{
/* set envelope counter from envleope output */
// WORKAROUND: The Kyra engine does something very strange when
// starting a new song. For each channel:
//
// * The release rate is set to "fastest".
// * Any note is keyed off.
// * A very low-frequency note is keyed on.
//
// Usually, what happens next is that the real notes is keyed
// on immediately, in which case there's no problem.
//
// However, if the note is again keyed off (because the channel
// begins on a rest rather than a note), the envelope counter
// was moved from the very lowest point on the attack curve to
// the very highest point on the release curve.
//
// Again, this might not be a problem, if the release rate is
// still set to "fastest". But in many cases, it had already
// been increased. And, possibly because of inaccuracies in the
// envelope generator, that would cause the note to "fade out"
// for quite a long time.
//
// What we really need is a way to find the correct starting
// point for the envelope counter, and that may be what the
// commented-out line below is meant to do. For now, simply
// handle the pathological case.
if (SLOT.evm == ENV_MOD_AR && SLOT.evc == EG_AST)
SLOT.evc = EG_DED;
else if ((SLOT.evc & EG_DST) == 0)
//SLOT.evc = (ENV_CURVE[SLOT.evc>>ENV_BITS]<<ENV_BITS) + EG_DST;
SLOT.evc = EG_DST;
SLOT.eve = EG_DED;
SLOT.evs = SLOT.evsr;
SLOT.evm = ENV_MOD_RR;
}
}
