Code Optimization
~~~~~~~~~~~~~~~~~

	The original working code is about 4k (not counting the pt3 file)
	and has an overhead of roughly 20% when playing a song interrupt-driven
	at 50Hz.

	I'm keeping some stats here as I try to optimize the size and speed.

	Song: "Summer of Rain" SR.PT3
	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
					lz4 compressed
	pt3 size:	raw size:	ym5 size:	pt3.lz4:
	3871		137015		7637		1793


	Size=pt3lib_end - note_a

	Decoder Type	size	ZP use	raw	decode	total	CPU overhead
	-------------------------------------------------------------
	Original	3407	22B	1F.22	31s	171s	18%
	VolTableGen	3302	22B	20.0E	32s	171s	19%
	SizeOpts	3262	22B	20.0A	32s	171s	19%
	MoreSizeOpt	3203	22B	1F.1D	31s	171s	18%
	Qkumba#1	2937	??	1D.18	29s	171s	17%
	Qkumba#2	2879	??	1C.18	28s	171s	16%
	Qkumba#3+vmw	2816	??	1C.22	28s	171s	16%

Times:							Validated
	BH.PT3:	10.0B	16	1:33	 93	17.2%	
	CH.PT3:	1D.12	29	2:49	169	17.2%
	CR.PT3:	0F.25	15	1:30	 90	16.7%	Yes
	DF.PT3:	19.1C	25	2:27	147	17.0%
	EA.PT3: 1E.13	30	2:53	173	17.3%	Yes
	F4.PT3:	18.1D	24	2:16	136	17.6%
	FC.PT3:	20.24	32	3:12	192	16.7%
	FR.PT3: 0B.0A	11	1:01	 61	18.0%
	HI.PT3:	11.19	17	1:34	 94	18.0%
	I2.PT3:	1E.0C	30	2:59	179	16.8%
	IT.PT3:	16.19	22	2:11	131	16.8%	Yes
	MB.PT3:	14.08	20	1:59	119	16.8%
	ND.PT3:	14.1C	20	1:52	112	17.9%
	OS.PT3:	13.24	19	1:48	108	17.6%
	RI.PT3:	0F.03	15	1:26	 86	17.4%
	SD.PT3:	11.16	17	1:40	100	17.0%
	SR.PT3: 1F.22	31	2:51	171	18.1%
	VC.PT3:	1B.20	27	2:40	160	16.9%