Pulse 1

$4000

Duty
Length Counter Halt
Constant Volume
Volume/Evp.Speed

$4001

Sweep Enable
Sweep Speed
Sweep Negate
Sweep Shift

$4002, $4003

Note
Length Counter Load

Pulse 2

$4004

Duty
Length Counter Halt
Constant Volume
Volume/Evp.Speed

$4005

Sweep Enable
Sweep Speed
Sweep Negate
Sweep Shift

$4006, $4007

Note
Length Counter Load

Triangle

$4008

Length/Linear Counter Halt
Linear Counter Load

$400A, $400B

Note
Length Counter Load

Noise

$400C

Length Counter Halt
Constant Volume
Volume/Evp.Speed

$400E

Periodic Noise
Frequency

$400F

Length Counter Load

DMC

$C000

Sample slot

$4010, ($4012, $4013)

Play sample Stop sample
Sample Loop
Sample Pitch
Sample Delay (Yxx effect)

$4011

Direct Write

General 2A03 controls

$4015: not emulated yet

$4017

Frame Counter Mode 1

VRC6 PU1

$9000

DC only Duty Volume

$9001, $9002

Note Enable

VRC6 PU2

$A000

DC only Duty Volume

$A001, $A002

Note Enable

VRC6 SAW

$B000

Volume

$B001, $B002

Note Enable

Paste VRC7 patch from FamiTracker
Write patch   

Modulator

Modulator Level Feedback Level
Attack Decay Sustain Release
Multiplier Key Level Scaling
Tremolo Vibrato Sustained Key Rate Scaling Half Sine

Carrier

Attack Decay Sustain Release
Multiplier Key Level Scaling
Tremolo Vibrato Sustained Key Rate Scaling Half Sine

VRC7 channel 1

Frequency Octave Volume
Patch
Key on Release override

VRC7 channel 2

Frequency Octave Volume
Patch
Key on Release override

VRC7 channel 3

Frequency Octave Volume
Patch
Key on Release override

VRC7 channel 4

Frequency Octave Volume
Patch
Key on Release override

VRC7 channel 5

Frequency Octave Volume
Patch
Key on Release override

VRC7 channel 6

Frequency Octave Volume
Patch
Key on Release override

FDS

$4023

Enable

$4040 - $407F

Paste FDS wave from FamiTracker Write wave

$4080 (Volume envelope)

Disable Direction Gain

$4082, $4083 (Wave frequency)

Note Disable Disable Envelopes

$4084 (Modulation depth envelope) (or "sweep envelope" or whatever the source calls it lol, FamiTracker doesn't even have an effect to write the sweep bits)

Disable Direction Gain

$4085 (Direct write mod counter) or "overflow counter" or other names grumble grumble grumble grumble can you please document this fucking chip in a vaguely consistent way? No? ok bye

$4086, $4087 (Modulation table frequency)

Modulation frequency Disable Force update on every clock (not implemented yet)

$4088

Paste FDS modulation table from FamiTracker Write table

$4089

Hold wave and enable write Master volume 100% 67% 50% 33%

$408A

Master envelope speed

MMC5 Pulse 1

$5000

Duty
Length Counter Halt
Constant Volume
Volume/Evp.Speed

$5002, $5003

Note
Length Counter Load

MMC5 Pulse 2

$5004

Duty
Length Counter Halt
Constant Volume
Volume/Evp.Speed

$5006, $5007

Note
Length Counter Load

N163 (all channels multiplexed)

Enable

Sunsoft 5B Square 1

Note
Enable Tone
Enable Noise
Enable Envelope
Volume

Sunsoft 5B Square 2

Note
Enable Tone
Enable Noise
Enable Envelope
Volume

Sunsoft 5B Square 3

Note
Enable Tone
Enable Noise
Enable Envelope
Volume

Sunsoft 5B Noise

Frequency

Sunsoft 5B Envelope

Period

Envelope shape

Continue
Direction
Alternate
Hold

\_______

Delta Buffer filters:

Bass Filter
Treble Filter
Pan strategy Saturated (Full Center) Linear (Half Center) Square Root (Center -3dB) Sine (Center -3dB) Square Root of Sine (Center -4.5dB)

Linear interpolation (faster, unaffected by treble filter) for channels:

2A03 Pulse 1
2A03 Pulse 2
2A03 Triangle
2A03 Noise
2A03 Dpcm
VRC6 Pulse 1
VRC6 Pulse 2
VRC6 Sawtooth
VRC7 Ch. 1
VRC7 Ch. 2
VRC7 Ch. 3
VRC7 Ch. 4
VRC7 Ch. 5
VRC7 Ch. 6
MMC5 Pulse 1
MMC5 Pulse 2
FDS
N163
S5B Square 1
S5B Square 2
S5B Square 3