APU register table/DSP global

See: APU register table

This table lists the 2 common names for the S-DSP global registers.

Name		Address	Bits	Type	Notes
MVOLL	MVOL (L)	$0C	SVVV VVVV	RW	Left channel main volume, signed.
MVOLR	MVOL (R)	$1C	SVVV VVVV	RW	Right channel main volume, signed.
EVOLL	EVOL (L)	$2C	SVVV VVVV	RW	Left channel echo volume, signed.
EVOLR	EVOL (R)	$3C	SVVV VVVV	RW	Right channel main volume, signed.
KON		$4C	7654 3210	RW	Key on. Writing this with any bit set will start a new note for the corresponding voice.
KOFF	KOF	$5C	7654 3210	RW	Key off. Writing this with any bit set will put the corresponding voice into its release state.
FLG		$6C	RMEN NNNN	RW	Flags: soft reset (R), mute all (M), echo disable (E), noise frequency (N).
ENDX		$7C	7654 3210	R	Read for end of sample flag for each channel.
EFB		$0D	SVVV VVVV	RW	Echo feedback, signed.
-	-	$1D	---- ----	RW	Unused.
PMON		$2D	7654 321-	RW	Enables pitch modulation for each channel, controlled by OUTX of the next lower channel.
NON		$3D	7654 3210	RW	For each channel, replaces the sample waveform with the noise generator output.
EON		$4D	7654 3210	RW	For each channel, sends to the echo unit.
DIR		$5D	DDDD DDDD	RW	Pointer to the sample source directory page at $DD00.
ESA		$6D	EEEE EEEE	RW	Pointer to the start of the echo memory region at $EE00.
EDL		$7D	---- DDDD	RW	Echo delay time (D).
FIR0	C0	$0F	SVVV VVVV	RW	Echo filter coefficient.
FIR1	C1	$1F	SVVV VVVV	RW	Echo filter coefficient.
FIR2	C2	$2F	SVVV VVVV	RW	Echo filter coefficient.
FIR3	C3	$3F	SVVV VVVV	RW	Echo filter coefficient.
FIR4	C4	$4F	SVVV VVVV	RW	Echo filter coefficient.
FIR5	C5	$5F	SVVV VVVV	RW	Echo filter coefficient.
FIR6	C6	$6F	SVVV VVVV	RW	Echo filter coefficient.
FIR7	C7	$7F	SVVV VVVV	RW	Echo filter coefficient.