!= — Determines if one value is not equal to another.
#define — Defines a macro.
#include — Includes an external file for processing.
#undef — Un-defines a macro.
#ifdef — Conditional reading of code.
#ifndef — Conditional reading of code.
$NAME — Calls a defined macro.
% — Modulus operator.
&& — Logical AND operator.
> — Determines if one value is greater than another.
>= — Determines if one value is greater than or equal to another.
< — Determines if one value is less than another.
<= — Determines if one value is less than or equal to another.
* — Multiplication operator.
+ — Addition operator
- — Subtraction operator.
/ — Division operator.
= — Performs a simple assignment.
== — Compares two values for equality.
^ — “Power of” operator.
|| — Logical OR operator.
0dbfs — Sets the value of 0 decibels using full scale amplitude.
& — Bitwise AND operator.
| — Bitwise OR operator.
¬ — Bitwise NOT operator.
# — Bitwise NON EQUIVALENCE operator.
a — Converts a k-rate parameter to an a-rate value with interpolation.
abetarand — Deprecated.
abexprnd — Deprecated.
abs — Returns an absolute value.
acauchy — Deprecated.
active — Returns the number of active instances of an instrument.
adsr — Calculates the classical ADSR envelope using linear segments.
adsyn — Output is an additive set of individually controlled sinusoids, using an oscillator bank.
adsynt — Performs additive synthesis with an arbitrary number of partials, not necessarily harmonic.
adsynt2 — Performs additive synthesis with an arbitrary number of partials -not necessarily harmonic- with interpolation.
aexprand — Deprecated.
aftouch — Get the current after-touch value for this channel.
agauss — Deprecated.
agogobel — Deprecated.
alinrand — Deprecated.
alpass — Reverberates an input signal with a flat frequency response.
ampdb — Returns the amplitude equivalent of the decibel value x.
ampdbfs — Returns the amplitude equivalent of the decibel value x, which is relative to full scale amplitude.
ampmidi — Get the velocity of the current MIDI event.
apcauchy — Deprecated.
apoisson — Deprecated.
apow — Deprecated.
areson — A notch filter whose transfer functions are the complements of the reson opcode.
aresonk — A notch filter whose transfer functions are the complements of the reson opcode.
atone — A hi-pass filter whose transfer functions are the complements of the tone opcode.
atonek — A hi-pass filter whose transfer functions are the complements of the tonek opcode.
atonex — Emulates a stack of filters using the atone opcode.
atrirand — Deprecated.
ATSadd — uses the data from an ATS analysis file to perform additive synthesis.
ATSaddnz — uses the data from an ATS analysis file to perform noise resynthesis.
ATSbufread — reads data from and ATS data file and stores it in an internal data table of frequency, amplitude pairs.
ATScross — perform cross synthesis from ATS analysis files.
ATSinfo — reads data out of the header of an ATS file.
ATSinterpread — allows a user to determine the frequency envelope of any ATSbufread.
ATSread — reads data from an ATS file.
ATSreadnz — reads data from an ATS file.
ATSpartialtap — returns a frequency, amplitude pair from an ATSbufread opcode.
ATSsinnoi — uses the data from an ATS analysis file to perform resynthesis.
aunirand — Deprecated.
aweibull — Deprecated.
babo — A physical model reverberator.
balance — Adjust one audio signal according to the values of another.
bamboo — Semi-physical model of a bamboo sound.
barmodel — Creates a tone similar to a stuck metal bar.
bbcutm — Generates breakbeat-style cut-ups of a mono audio stream.
bbcuts — Generates breakbeat-style cut-ups of a stereo audio stream.
betarand — Beta distribution random number generator (positive values only).
bexprnd — Exponential distribution random number generator.
bformenc — Codes a signal into the ambisonic B format
bformdec — Decodes an ambisonic B format signal
binit — PVS tracks to amplitude+frequency conversion.
biquad — A sweepable general purpose biquadratic digital filter.
biquada — A sweepable general purpose biquadratic digital filter with a-rate parameters.
birnd — Returns a random number in a bi-polar range.
bqrez — A second-order multi-mode filter.
butbp — Same as the butterbp opcode.
butbr — Same as the butterbr opcode.
buthp — Same as the butterhp opcode.
butlp — Same as the butterlp opcode.
butterbp — A band-pass Butterworth filter.
butterbr — A band-reject Butterworth filter.
butterhp — A high-pass Butterworth filter.
butterlp — A low-pass Butterworth filter.
button — Sense on-screen controls.
buzz — Output is a set of harmonically related sine partials.
cabasa — Semi-physical model of a cabasa sound.
cauchy — Cauchy distribution random number generator.
ceil — Returns the smallest integer not less than x
cent — Calculates a factor to raise/lower a frequency by a given amount of cents.
cggoto — Conditionally transfer control on every pass.
chanctrl — Get the current value of a MIDI channel controller.
changed — k-rate signal change detector.
chani — Reads data from the software bus
chano — Send data to the outwards software bus
chebyshevpoly — Efficiently evaluates the sum of Chebyshev polynomials of arbitrary order.
checkbox — Sense on-screen controls.
chn — Declare a channel of the named software bus.
chnclear — Clears an audio output channel of the named software bus.
chnexport — Export a global variable as a channel of the bus.
chnget — Reads data from the software bus.
chnmix — Writes audio data to the named software bus, mixing to the previous output.
chnparams — Query parameters of a channel.
chnset — Writes data to the named software bus.
cigoto — Conditionally transfer control during the i-time pass.
ckgoto — Conditionally transfer control during the p-time passes.
clear — Zeroes a list of audio signals.
clfilt — Implements low-pass and high-pass filters of different styles.
clip — Clips a signal to a predefined limit.
clock — Deprecated.
clockoff — Stops one of a number of internal clocks.
clockon — Starts one of a number of internal clocks.
cngoto — Transfers control on every pass when a condition is not true.
comb — Reverberates an input signal with a “colored” frequency response.
compress — Compress, limit, expand, duck or gate an audio signal.
control — Configurable slider controls for realtime user input.
convle — Same as the convolve opcode.
convolve — Convolves a signal and an impulse response.
cos — Performs a cosine function.
cosh — Performs a hyperbolic cosine function.
cosinv — Performs a arccosine function.
cps2pch — Converts a pitch-class value into cycles-per-second (Hz) for equal divisions of the octave.
cpsmidi — Get the note number of the current MIDI event, expressed in cycles-per-second.
cpsmidib — Get the note number of the current MIDI event and modify it by the current pitch-bend value, express it in cycles-per-second.
cpsmidinn — Converts a Midi note number value to cycles-per-second.
cpsoct — Converts an octave-point-decimal value to cycles-per-second.
cpspch — Converts a pitch-class value to cycles-per-second.
cpstmid — Get a MIDI note number (allows customized micro-tuning scales).
cpstun — Returns micro-tuning values at k-rate.
cpstuni — Returns micro-tuning values at init-rate.
cpsxpch — Converts a pitch-class value into cycles-per-second (Hz) for equal divisions of any interval.
cpuprc — Control allocation of cpu resources on a per-instrument basis, to optimize realtime output.
cross2 — Cross synthesis using FFT's.
crunch — Semi-physical model of a crunch sound.
ctrl14 — Allows a floating-point 14-bit MIDI signal scaled with a minimum and a maximum range.
ctrl21 — Allows a floating-point 21-bit MIDI signal scaled with a minimum and a maximum range.
ctrl7 — Allows a floating-point 7-bit MIDI signal scaled with a minimum and a maximum range.
ctrlinit — Sets the initial values for a set of MIDI controllers.
cuserrnd — Continuous USER-defined-distribution RaNDom generator.
dam — A dynamic compressor/expander.
date — Returns the number seconds since 1 January 1970.
dates — Returns as a string the date and time specified.
db — Returns the amplitude equivalent for a given decibel amount.
dbamp — Returns the decibel equivalent of the raw amplitude x.
dbfsamp — Returns the decibel equivalent of the raw amplitude x, relative to full scale amplitude.
dcblock — A DC blocking filter.
dconv — A direct convolution opcode.
delay — Delays an input signal by some time interval.
delay1 — Delays an input signal by one sample.
delayk — Delays an input signal by some time interval.
delayr — Reads from an automatically established digital delay line.
delayw — Writes the audio signal to a digital delay line.
deltap — Taps a delay line at variable offset times.
deltap3 — Taps a delay line at variable offset times, uses cubic interpolation.
deltapi — Taps a delay line at variable offset times, uses interpolation.
deltapn — Taps a delay line at variable offset times.
deltapx — Read to or write from a delay line with interpolation.
deltapxw — Mixes the input signal to a delay line.
denorm — Mixes low level noise to a list of a-rate signals
diff — Modify a signal by differentiation.
diskgrain — Synchronous granular synthesis, using a soundfile as source.
diskin — Reads audio data from an external device or stream and can alter its pitch.
diskin2 — Reads audio data from a file, and can alter its pitch using one of several available interpolation types, as well as convert the sample rate to match the orchestra sr setting.
dispfft — Displays the Fourier Transform of an audio or control signal.
display — Displays the audio or control signals as an amplitude vs. time graph.
distort — Distort an audio signal via waveshaping and optional clipping.
distort1 — Modified hyperbolic tangent distortion.
divz — Safely divides two numbers.
downsamp — Modify a signal by down-sampling.
dripwater — Semi-physical model of a water drop.
dssiactivate — Activates or deactivates a DSSI or LADSPA plugin.
dssiaudio — Processes audio using a LADSPA or DSSI plugin.
dssictls — Send control information to a LADSPA or DSSI plugin.
dssiinit — Loads a DSSI or LADSPA plugin.
dssilist — Lists all available DSSI and LADSPA plugins.
dumpk — Periodically writes an orchestra control-signal value to an external file.
dumpk2 — Periodically writes two orchestra control-signal values to an external file.
dumpk3 — Periodically writes three orchestra control-signal values to an external file.
dumpk4 — Periodically writes four orchestra control-signal values to an external file.
duserrnd — Discrete USER-defined-distribution RaNDom generator.
else — Executes a block of code when an "if...then" condition is false.
elseif — Defines another "if...then" condition when a "if...then" condition is false.
endif — Closes a block of code that begins with an "if...then" statement.
endin — Ends the current instrument block.
endop — Marks the end of an user-defined opcode block.
envlpx — Applies an envelope consisting of 3 segments.
envlpxr — The envlpx opcode with a final release segment.
eqfil — Equalizer filter
event — Generates a score event from an instrument.
event_i — Generates a score event from an instrument.
exitnow — Exit csound as fast as possible, with no cleaning up.
exp — Returns e raised to the x-th power.
expcurve — This opcode implements a formula for generating a normalised exponential curve in range 0 - 1. It is based on the Max / MSP work of Eric Singer (c) 1994.
expon — Trace an exponential curve between specified points.
exprand — Exponential distribution random number generator (positive values only).
expseg — Trace a series of exponential segments between specified points.
expsega — An exponential segment generator operating at a-rate.
expsegr — Trace a series of exponential segments between specified points including a release segment.
ficlose — Closes a previously opened file.
filelen — Returns the length of a sound file.
filenchnls — Returns the number of channels in a sound file.
filepeak — Returns the peak absolute value of a sound file.
filesr — Returns the sample rate of a sound file.
filter2 — Performs filtering using a transposed form-II digital filter lattice with no time-varying control.
fin — Read signals from a file at a-rate.
fini — Read signals from a file at i-rate.
fink — Read signals from a file at k-rate.
fiopen — Opens a file in a specific mode.
flanger — A user controlled flanger.
flashtxt — Allows text to be displayed from instruments like sliders
FLbox — A FLTK widget that displays text inside of a box.
FLbutBank — A FLTK widget opcode that creates a bank of buttons.
FLbutton — A FLTK widget opcode that creates a button.
FLcloseButton — A FLTK widget opcode that creates a button that will close the panel window it is a part of.
FLcolor — A FLTK opcode that sets the primary colors.
FLcolor2 — A FLTK opcode that sets the secondary (selection) color.
FLcount — A FLTK widget opcode that creates a counter.
FLexecButton — A FLTK widget opcode that creates a button that executes a command.
FLgetsnap — Retrieves a previously stored FLTK snapshot.
FLgroup — A FLTK container opcode that groups child widgets.
FLgroupEnd — Marks the end of a group of FLTK child widgets.
FLgroupEnd — Marks the end of a group of FLTK child widgets.
FLhide — Hides the target FLTK widget.
FLhvsBox — Displays a box with a grid useful for visualizing two-dimensional Hyper Vectorial Synthesis.
FLhvsBoxSetValue — Sets the cursor position of a previously-declared FLhvsBox widget.
FLjoy — A FLTK opcode that acts like a joystick.
FLkeyIn — Reports keys pressed (on alphanumeric keyboard) when an FLTK panel has focus.
FLknob — A FLTK widget opcode that creates a knob.
FLlabel — A FLTK opcode that modifies the appearance of a text label.
FLloadsnap — Loads all snapshots into the memory bank of the current orchestra.
FLmouse — Returns the mouse position and the state of the three mouse buttons.
flooper — Function-table-based crossfading looper.
flooper2 — Function-table-based crossfading looper.
floor — Returns the largest integer not greater than x
FLpack — Provides the functionality of compressing and aligning FLTK widgets.
FLpackEnd — Marks the end of a group of compressed or aligned FLTK widgets.
FLpack_end — Marks the end of a group of compressed or aligned FLTK widgets.
FLpanel — Creates a window that contains FLTK widgets.
FLpanelEnd — Marks the end of a group of FLTK widgets contained inside of a window (panel).
FLpanel_end — Marks the end of a group of FLTK widgets contained inside of a window (panel).
FLprintk — A FLTK opcode that prints a k-rate value at specified intervals.
FLprintk2 — A FLTK opcode that prints a new value every time a control-rate variable changes.
FLroller — A FLTK widget that creates a transversal knob.
FLrun — Starts the FLTK widget thread.
FLsavesnap — Saves all snapshots currently created into a file.
FLscroll — A FLTK opcode that adds scroll bars to an area.
FLscrollEnd — A FLTK opcode that marks the end of an area with scrollbars.
FLscroll_end — A FLTK opcode that marks the end of an area with scrollbars.
FLsetAlign — Sets the text alignment of a label of a FLTK widget.
FLsetBox — Sets the appearance of a box surrounding a FLTK widget.
FLsetColor — Sets the primary color of a FLTK widget.
FLsetColor2 — Sets the secondary (or selection) color of a FLTK widget.
FLsetFont — Sets the font type of a FLTK widget.
FLsetPosition — Sets the position of a FLTK widget.
FLsetSize — Resizes a FLTK widget.
FLsetsnap — Stores the current status of all FLTK valuators into a snapshot location.
FLsetSnapGroup — Determines the snapshot group for FL valuators.
FLsetText — Sets the label of a FLTK widget.
FLsetTextColor — Sets the color of the text label of a FLTK widget.
FLsetTextSize — Sets the size of the text label of a FLTK widget.
FLsetTextType — Sets some font attributes of the text label of a FLTK widget.
FLsetVal_i — Sets the value of a FLTK valuator to a number provided by the user.
FLsetVal — Sets the value of a FLTK valuator at control-rate.
FLshow — Restores the visibility of a previously hidden FLTK widget.
FLslidBnk — A FLTK widget containing a bank of horizontal sliders.
FLslidBnk2 — A FLTK widget containing a bank of horizontal sliders.
FLslidBnkGetHandle — gets the handle of last slider bank created.
FLslidBnkSet — modify the values of a slider bank.
FLslidBnkSetk — modify the values of a slider bank.
FLslidBnk2Set — modify the values of a slider bank.
FLslidBnk2Setk — modify the values of a slider bank.
FLslider — Puts a slider into the corresponding FLTK container.
FLtabs — Creates a tabbed FLTK interface.
FLtabsEnd — Marks the end of a tabbed FLTK interface.
FLtabs_end — Marks the end of a tabbed FLTK interface.
FLtext — A FLTK widget opcode that creates a textbox.
FLupdate — Same as the FLrun opcode.
fluidAllOut — Collects all audio from all Fluidsynth engines in a performance
fluidCCi — Sends a MIDI controller data message to fluid.
fluidCCk — Sends a MIDI controller data message to fluid.