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=============================================================================
OVERVIEW
EIF stands for "Echo Instrument Format" and it's the format in which FM
instruments are stored.
FORMAT
EIF instruments are essentially raw dumps of the YM2612 registers. They
consist of 29 bytes, where each byte belongs to a different YM2612
register. The registers are stored in the following order (assuming the
first FM channel):
$B4 -- Algorithm and feedback
$30, $34, $38, $3C -- Multiplier and detune
$40, $44, $48, $4C -- Total level
$50, $54, $58, $5C -- Attack rate
$60, $64, $68, $6C -- Decay rate
$70, $74, $78, $7C -- Sustain rate
$80, $84, $88, $8C -- Release rate and sustain level
$90, $94, $98, $9C -- SSG-EG
Some bits are unused and ignored by the YM2612. In an EIF instrument,
they *must* be 0, since Echo will rely on this for optimization purposes.
=============================================================================
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