Fruity Formula Controller

Fruity Formula Controller generates automation control data based on user-defined formulae. It can be used for boolean (true or false) operations, like creating logic gates and conditional statements, where the output is dependent on the state of the variable(s). The Formula Controller will appear as a Formula ctrl - Out option in the Link dialog. It is just one of the many internal automation controllers available in FL Studio.

How to use:

  1. Load Fruity Formula Controller in a Mixer FX Slot. NOTE: Renaming the Formula Controller will help you find the correct automation source when more than one is used in a project.
  2. Enter a formula or select one from the plugin presets and make sure it compiles correctly.
  3. Link the target Synth, Effect or FL Studio interface control to the 'Formula ctrl - Out' option (or custom name used at step 1) from the Link Dialog > 'Link assignment' menu.
  4. Link other internal or external hardware controllers to variables A, B and C OR record A, B, C tweaks in real-time as the project is playing.
  5. Alternatively, Fruity Formula Controller can be routed in Patcher.


  • A/B/C - These knobs can be used as variables in your formulas. Enter them into your formula as a, b and c variables (see the list of operators and functions below).
  • Formula - This is where you enter your formula. Press ENTER or Compile to compile a formula. If the formula is a valid mathematical expression, you will see a message 'Compiled ok' below the formula. If it's not, you will see a helpful error message. NOTE: The output of the formula must range between 0 to 1 in order to qualify as valid control data. (see below).
  • ? - Opens the Syntax, Objects and Functions table (see below).
  • Compile - Compiles the formula. Alternatively press ENTER when using the formula edit box.
  • Comments - Type comments here. If text exceeds the height of the window a scroll-bar will appear on the right side. Supports RTF text from WordPad. The formula Monitor graph also displays behind the text for your convenience.
  • Monitor - Shows the output from the formula in real-time. NOTE: Many formulas will not display as a moving trace until you click Play on FL Studio's transport panel.

Syntax, Objects & Functions

The following syntax, functions and objects are supported by the Formula Controller:

Abbreviation Description Example
+ addition a+b
* multiplication a*b
- subtraction  a-b
/ division  a/b
^ power a^b
= comparison, equal a=b
in same as = a in b
<> not equal a=b
> greater than a>b
>= greater than or equal a>=b
<= lesser than or equal a<=b
< lesser than a<b
% converts percentages into decimal values Value%
! factorial, returns the scalar part of a a!*b
div integer divide Numerator div Denominator
mod modulo, returns the remainder of a/b a mod b
fmod floating point modulo a mod b
not logical not, returns 1 when a <= 0.5 and 0 when a > 0.5 not a
or logical or, returns 1 when a or b or both are > 0.5 a or b
and logical and, returns 1 when both a and b are > 0.5 a and b
xor logical xor, returns 1 when a or b is > 0.5 a xor b
shr integer shift bits right (divide), equivalent to x/2^y Value shr Amount
shl integer shift bits left (multiply), equivalent to x*2^y Value shl Amount
Abs absolute, flips the negative part of an output into positive Abs(a)
ArcCos inverse cosine ArcCos(a)
ArcCosh hyperbolic inverse cosine ArcCos(a)
ArcSin inverse sine ArcSin(a)
ArcTg antitangent ArcTg(a)
ArcTanh hyperbolic inverse tangent ArcTg(a)
ATan2 arctangent angle/quadrant of a given number Atan2(a,b)
Case returns b if a=1, else returns c Case(a,b,c)
Cos cosine Cos(a)
Cosh hyperbolic cosine Cos(a)
CoSec cosecant CoSec(a)
DegToRad convert degree value to radians DegToRad(a)
Ceil rounds up to nearest integer Ceil(a)
Ctg cotangent Ctg(a)
Exp exponential Exp(a)
Floor rounds down to nearest integer, same as Int Floor(a)
Fold wave folding operation Fold(a)
Frac fractional part Frac(a)
If if a > 0.5 then b, else c if(a,b,c)
IfE returns 1 if a=b IfE(a,b)
IfG returns 1 if a>b IfG(a,b)
IfGE returns 1 if a>=b IfGE(a,b)
IfL returns 1 if a<b IfL(a,b)
IfLE returns 1 if a<=b IfLE(a,b)
Int integral part Int(a)
Inter returns 1 if a > b and a < c. If c < b, b & c values will be swapped Inter(a,b,c)
Internoswap as Inter but doesn't swap a & b Internoswap(a,b,c)
Intpower integer power, Value^Power Intpower(Value, Power)
Ln logarithm base e Ln(a)
Log10 logarithm base 10 Log10(a)
Log2 logarithm base 2 Log2(a)
LogN logarithm a is the base, b is the number to calculate from LogN(a,b)
Map maps the value a into the range b..c, equivalent to x * (z - y) + y Map(a,b,c)
Max maximum, returns the greater input Max(a,b)
Min minimum, returns the lesser input Min(a,b)
Neg negative Neg(a)
Pi returns the value of pi Pi
Power floating point power, a^b Power(a,b)
Pow floating point power, a^b Pow(a,b)
RadToDeg convert radian value to degrees RadToDeg(a)
Rand outputs continuous random values (0..1) Rand
Round round to nearest integer Round(a)
Sec secant Sec(a)
SeededRand static random value (0..1), changes when seed is changed SeededRand(Seed)
Sin sine Sin(a)
Sinh hyperbolic sine Sinh(a)
Sqrt square root Sqrt(a)
Sqr square (same as a^2) Sqr(a)
Sum sum of arguments Sum(a,b)
Tg tangent Tg(a)
Tan tangent Tan(a)
Tanh hyperbolic tangent Tanh(a)
Trunc truncate, limits the number of digits right of the decimal point Trunc(Value)
Warp warps signal a around to warp point b Warp(a,b)
Special (FL Studio-related)
a value of knob A a
b value of knob B b
c value of knob C c
SongTime song position, in quarters SongTime()
Time system time, in ms Time()
Tension Curves the line, positive or negtively depending on sign Tension(Value,Rate of change)
Date system date Date()
MouseX mouse cursor X position MouseX()
MouseY mouse cursor Y position MouseY()
NOTE: Fruity Formula Controller is not case sensitive, so all of the operators, functions and variables will compile even if not typed in a similar manner as in this table.


Fruity Formula Controller can only output values that are within the range of 0 to 1. For certain functions however, there's a wider range of potential output values outside of the visible range, which can be useful for intermediate steps of the calculation (i.e. before the final output value). For example, the CoSec() -function by definition has a range of y≤−1 or y≥1, which means all real numbers except those in between -1 and 1. In the image below, the CoSec() -function has been resized to display a wider range in the output. There are also functions that only return integers, which means that without scaling they only appear to return either 1 or 0.

Manipulating Functions

Sine Function Example

Let's examine the formula 0.5*Sin(SongTime*Pi*2+0.25)+0.5, which outputs a sine wave. Below the formula has been broken down into individual components, described as A - amplitude multiplier, F - frequency multiplier, O - offset and P - phase offset.

  • Multiplication/division outside of the function (A) scales the amplitude of the output.
  • Multiplication/division inside of the function (F) scales the frequency of the output. A higher scalar value outputs a higher frequency.
  • Addition/subtraction outside of the function (O) offsets the output (moves it up or down).
  • Addition/subtraction inside of the function (P) offsets the starting phase of the output (moves it left or right).
  • To observe a moving trace, SongTime or Time must be used inside of the function, or alternatively any changing control data from outside of the Formula Controller connected to one of the variables.
  • Multiplying SongTime with a multiple of Pi makes the resulting waveform fit evenly into the length of a pattern. Pi represents half a cycle in radians, and 2*Pi represents a complete cycle. A sine wave is shaped symmetrically in every half cycle period. In order for the output to keep repeating a complete half cycle, the frequency must be scaled by a multiple of pi. Example: 0.5*Sin(SongTime*Pi*(Int(b*10))) + 0.5 creates a sine wave, where parameter b adjusts the frequency. The Int() -function is used to transform b into integer values, so that the frequency can only be changed in half cycle increments (Pi * integer).

Example Formulas

Basic Waveforms
Name Description Formula
Sine basic sine wave 0.5*Sin(SongTime*Pi)+0.5
Sine sine wave with an adjustable amplitude, frequency and offset a*Sin(SongTime*Pi*b)+c
Sine as above, but the frequency has discrete values a*Sin(SongTime*Pi*(Int(b*10)))+c
Sine sine wave with an adjustable amplitude, initial phase and offset a*Sin(SongTime*Pi+b*Pi)+c
Triangle basic triangle wave 0.319*ArcCos(Cos(SongTime*Pi))
Triangle triangle wave with an adjustable amplitude, frequency and offset a*ArcCos(Cos(SongTime*Pi*2*b))+c
Triangle as above, but the frequency has discrete values a*ArcCos(Cos(SongTime*Pi*(Int(b*10))))+c
Triangle triangle with an adjustable amplitude, initial phase and offset a*ArcCos(Cos(SongTime*Pi+b*Pi))+c
Sawtooth basic sawtooth Frac(SongTime)
Sawtooth sawtooth with an adjustable amplitude, frequency and offset a*Frac(SongTime*b*2)+c
Sawtooth as above, but the frequency has discrete values a*Frac(SongTime*0.5*Int(b*10))+c
Sawtooth sawtooth with an adjustable direction Abs(Round(a)-Frac(SongTime))
Square basic square with 50% duty cycle Round(0.5*Sin(SongTime*Pi*2)+0.5)
Square square with an adjustable amplitude, frequency and offset a*Round(0.5*Sin(SongTime*Pi*2*b)+0.5)+c
Square as above, but the frequency has discrete values a*Round(0.5*Sin(SongTime*Pi*(Int(b*10)))+0.5)+c
Pulse square with an adjustable pulse width Round(0.5*Sin(SongTime*Pi)+a)
Sample and hold random output with adjustable amplitude, frequency and offset b*SeededRand(Int(SongTime*a))+c
Boolean Operations
Buffer input equal to the output a
NOT inverse of buffer 1-a
AND both a and b must be 1 to return 1 a*b
OR either a, b or both must be 1 to return 1 a+b
XOR exclusive or, either a or b must be 1 to return 1 (a+b)=1
NAND inverse of and 1-(a*b)
NOR inverse of or (a+b)=0
XNOR inverse of xor a=b
NOTE: Boolean operations will behave correctly when using boolean values, either 1 or 0 (true or false). The operators used are regular arithmetic operators and may output different results with other types of values.


Plugin Credits: Didier Dambrin, Andrew Tumashinov (RapidEvaluator)