The calculateLowByte1() and 2() functions are used for calculating the "total

level", which I believe is the individual channel volume. (The functions also
return the "scaling level" bits, but they are preserved, not calculated.) I
have renamed these functions calculateOpLevel1() and 2().

The unk25 and unk26 variables have been renamed opLevel1 and opLevel2. These
are called oplvl_1 and oplvl_2 in our MidiDriver_ADLIB class.

The unk26, unk27 and unk28 variables are potentially added to both operator
levels, and have been renamed opExtraLevel1, opExtralevel2 and opExtraLevel3.

The updateCallback25() function has been remamed update_setExtraLevel1().
The updateCallback33() function has been renamed update_setExtraLevel2().
The updateCallback32() function has been renamed update_setExtraLevel3().

Note that these callbacks aren't quite as similar as their names would seem to
indicate: They differ in whether or not the volume is updated and/or how the
parameters are passed.

svn-id: r21199

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