Tuning inaccuracy

[jwt27]

Noticed you used these FNUM values, presumably copied from the original driver:

es1969/src/nt4/mmedia/es1969/synthlib/NATV.C

Lines 78 to 82 in dc95b62

	SHORT fnum[12] = {
	514, 544, 577, 611, /* G , G#, A , A# */
	647, 686, 727, 770, /* B , C , C#, D */
	816, 864, 916, 970 /* D#, E , F, F# */
	};

I believe those were calculated with fs=50000 (instead of 49716), so the pitch is about 10 cents off. Not immediately noticeable, but might become an issue if someone uses this for music production and expects it to be in tune with other sounds.

The following numbers will be more accurate:

517, 547, 580, 615,
651, 690, 731, 774,
820, 869, 921, 975

On the other hand, this could clash with any fixed-pitch voices in the existing patch banks, so changing it might not improve the general use case. But maybe that's only percussion. You decide :)