FamiTracker's effects commands are mostly based on those found in '[[FastTracker II].  FamiTracker's effects columns are expandable and collapsible so each channel can use more than one effect at a time.  This can be helpful if you are an audio micro-managing freak!  :D

'[#[Effects Reference]
'[t[b0]0xy'[/t] - Arpeggio aka '[[arps]; fast note shifting in half steps.
x = Number of half steps from root note for first shift
y = Number of half steps from root note for second shift

Ex: 037 = Minor chord. 047 = Major chord. 
View article on '[[arps] for more examples.


'[t[b0]1xx'[/t] - Portamento up; smooth pitch glide up.
If xx > 00 = Speed
If xx = 00 = Off


'[t[b0]2xx'[/t] - Portamento down; smooth pitch glide down.
If xx > 00 = Speed
If xx = 00 = Off


'[t[b0]3xx'[/t] - Glissando; pitch glide to next note.
If xx > 00 = Speed
If xx = 00 = Off


'[t[b0]4xy'[/t] - Vibrato; pitch vibration.
If x > 0 = Speed
If x = 0 = Off
y = Depth


'[t[b0]7xy'[/t] - Tremolo; volume tremor.
If x > 0 = Speed
If x = 0 = Off
y = Depth


'[t[b0]Axy'[/t]- Volume slide up/down from set volume.
If x = n > y, then volume slide speed up "n" ticks depth
If y = n < x, then volume slide speed down "n" ticks depth
If x = y, then halt slide


'[t[b0]Bxx'[/t] - Jump to frame xx.
xx = Hexadecimal frame value 


'[t[b0]Cxx'[/t] - Halt; end song.
xx = Inconsequencial


'[t[b0]Dxx'[/t] - Skip to next frame and start at xx.
xx = Hexadecimal frame value 


'[t[b0]Exx'[/t] - Set Volume; DEPRECATED.  Please use Volume column.
If x = 00-15 = Volume value


'[t[b0]Fxx'[/t] - Set Speed/Tempo.
If 0 < xx < 20 = Speed value
If 20 <  xx < FF = Tempo value 


'[t[b0]Gxx'[/t] - Note delay.
xx = Amount of ticks to delay note


'[t[b0]Hxy'[/t] - Trigger hardware note sweep up.
If x = 0-7 = Duration
If y = 0-7 = Shift
This feature is only avaliable for the Square channels. 


'[t[b0]Ixy'[/t] - Trigger hardware note sweep down.
If x = 0-7 = Duration
If y = 0-7 = Shift 
This feature is only avaliable for the Square channels. 


'[t[b0]Pxx'[/t] - Fine pitch setting.
If xx = 80 = Default
If xx > 80 = Increase pitch
If xx < 80 = Decrease pitch


'[t[b0]Qxy'[/t] - Pitch slide up
x = Speed
y = The number of half-steps slid from provided note


'[t[b0]Rxy'[/t] - Pitch slide down
x = Speed
y = The number of half-steps slid from provided note


'[t[b0]Vxx'[/t] - Set Square Duty Cycling / Noise Pattern
xx = Square / Noise
00 = 12.5% Duty / White Noise
01 = 25% Duty / Periodic Noise
02 = 50% Duty / White Noise
03 = 75% Duty / Periodic Noise
This feature is only available for Square and Noise channels.
There are only two patterns available for Noise, whereas there are 4 duty cycles to choose from for Square.


'[t[b0]Yxx'[/t] - Start Sample Offset; DPCM skipping.
If xx > 00, then start "n" offset 64 byte steps from start of sample.

Refer to this table via decimal to hex as a reference to when the "pitch" is changed of a DMC sample:
'[t[code]DMC Sampling rate(0-F) (Default:F 33.14KHz)
      0: 4.18KHz  1: 4.71KHz  2: 5.26KHz  3: 5.59KHz
      4: 6.26KHz  5: 7.05KHz  6: 7.92KHz  7: 8.36KHz
      8: 9.42KHz  9:11.18KHz  A:12.60KHz  B:13.98KHz
      C:16.88KHz  D:21.30KHz  E:24.86KHz  F:33.14KHz'[/t]

Note: Currently using a value of xx higher than length of sample results in a weird sample looping in the tracker but comes out only a loud weird glitch upon NSF export.


'[t[b0]Zxx'[/t] - Set the DPCM's delta counter (DC); affects volume of triangle, noise, and DPCM.
Regarding Noise and Triangle:  If xx > 00 the volume of the channels is decreased by the offset due to distortion of DC.
Regarding DPCM channel:  xx = offset amount of distortion incremented or decremented, resulting in volume either up or down; depending on current DC value.

Note #1:  The DC counts down and is affected by DC resets provided by the DMC sample and the current DC register value.  In summary, the value supplied is relative to the sample and the counter.

Note #2: Using Zxx in large intervals (ex: Z7F and then Z00) causes a 'clicking' sound due to a radical peak in the wave.  Click volume can be manipulated with lower intervals and lower values.  Clicks can be used as a form of precussion.

'[#[Further Notes]
Exx will not work if an instrument volume effect loop is used. 

1xx will not work if an instrument frequency effect loop is used. (Pitch, Hi-pitch and Arpeggio.) 

If effects commands seem different or don't work for you, download the latest BotB leak of '[[FamiTracker].