User-Defined Opcode Database

Edited by

Steven Yi

This is a repository of User-Defined Opcodes for the Csound music synthesis software. User-Defined Opcodes are opcodes for Csound created using Csound orchestra text. More information about User-Defined Opcodes can be found here.

Opcodes

Signal Generators

ADSD - An envelope generator modelling the classic analogue ADSD envelopes

BufFiPl1 - Plays a mono sample from a GEN01 function table, including sample rate conversion

BufFiPl2 - Plays a stereo sample from two GEN01 function tables, including sample rate conversion

BufFiPl4 - Plays a four channel sample from four GEN01 function tables, including sample rate conversion

BufFiPl8 - Plays an eight channel sample from eight GEN01 function tables, including sample rate conversion

BufPlay1 - Plays audio from a mono buffer (function table), with different options

BufPlay2 - Plays audio from a stereo buffer (two function tables), with different options

FilePlay1 - Plays a mono signal from a mono or stereo soundfile

FilePlay2 - Plays a stereo signal from a mono or stereo soundfile

footarray - Interface for a foot array which outputs program change MIDI messages. Can be used with any MIDI program change capable device.

GaussTrig - Outputs a-rate impulses around a certain frequency.

Linek - performs a linear interpolation from one value to another value in a certain time whenever a trigger is received

LpPhsr - creates a time pointer for loops

msrOsc - Simple Generator

p5glove - Unit generator for P5 data glove

PartikkelSimpA - A simplified version of the Partikkel opcode, but with some additional parameters

PartikkelSimpB - The same as PartikkelSimpA, but with a time pointer input

pgmin - Read program change messages from MIDI input.

RandomWalkA - Generate random walk at a-rate

RandomWalkK - Generate random walk at k-rate

rbatonPercPad - Senses trigger/whack strength as well as X and Y coordinates of the two batons in a Max Mathew's Radio Baton system.

rbatonPot - Implements a sensor for the 4 pots, 2 footswitches and B15+ button on the Max Mathew's Radio Baton unit.

rbatonXYZ - polls X, Y, and Z coordinates of a Max Mathew's Radio Baton.

stereoGrain - Granular synthesis similar to granule but in stereo with control rate parameters and unlimited transpositions.

vowgen - fof-based vocal generator with morfable vowels

Signal Modifiers

Effects

Baboon - UDO wrapper for the babo opcode

decimator - Sample rate / Bit depth reduce. Based on the work of Steven Cook. k-rate parameters.

ensembleChorus - A stereo chorus opcode with multiple voices.

freqShift - Detunes an audio signal

PitchShifter - Delay-line pitchshifter

SCReverb - 8 delay line stereo FDN reverb

SigRec - A table-based signal recorder (looping sampler), with pitch control

SigReverse - A table-based reversing opcode.

trackerSplice - signal splicer

Filters

Fofilter - A formant filter version of the FOF opcode.

Moogladder - An improved implementation of the Moog ladder filter

Statevar - A digital version of the analogue state variable filter.

tap_tubewarmth - tap_tubewarmth - A port of Tom Szilagyi's TAP TubeWarmth LADSPA plugin to a Csound User-Defined Opcode

Vocoder - channel vocoder with user-specified number of bands

vowel - vowel filter with morfable vowels

Panning and Spatialization

bformatQuad - Converts quadrophonic to b-format.

bformatStereo - Converts stereo to b-format ambisonics.

PanPotStereo - pans stereo input to stereo output

pan_delay_and_filtered - Pan using delay and filters

pan_equal_power - Equal Power Panning

pan_gm2 - Equal Power Panning scheme defined by MIDI Association for GM2 in RP-036

pan_simple - Simple Linear Pan

pan_sin - Pan using Sin/Cos to create more even power between channels

pan_sqrt - sqrt method for panning

quadBformat - Converts b-format to quadrophonic.

stereoAsymmetry - Side-only panning of a stereo signal

stereoBalance - Stereo 'panning' using the balance technique.

stereoBformat - Converts b-format ambisonics to uhj stereo.

stereoMpan - Middle panorama panning of the 'M' component of a stereo signal

stereoMS - Converts Stereo to MS and MS to Stereo.

stereoRotate - Stereo 'panning' using the middle-side technique.

stereoWidth - Changes the image width of a stereo signal

declick - removes clicks from signal start and end

Residual - extracts stochastic components (transients etc) from a sound (using csound 5 opcodes)

Utilities

ampdbN - Normalized conversion from db to amplitude.

ampSlider - Converts a scaled (0-1) value to a value resembling a hardware mixer slider.

BufCt1 - creates a function table of ilen seconds for recording

BufCt2 - creates two function tables of ilen seconds for recording

BufFiCt1 - creates a gen01 function table from a mono soundfile

BufFiCt2 - creates two gen01 function table from a stereo soundfile

BufFiCt4 - creates fout gen01 function table from a four channel soundfile

BufFiCt8 - creates eight gen01 function table from an eight channel soundfile

BufFiCtNd1 - creates a non deferred function table from a mono soundfile and returns its length

BufFiCtNd2 - creates two non deferred function tables from a stereo soundfile and returns the length

BufRec1 - Records in a mono buffer (function table)

BufRec2 - Records in a stereo buffer (= two function tables)

Counter - Step counter

cpsmid - Converts MIDI Note Number to Cycles per second (Hz)

deflutter - deflutter k-rate input (data smoothing)

ExpCurve - Normalised exponential curve with variable steepness.

F2M - Comverts a frequency to the next possible MIDI note number

F2MC - converts a frequency to a MIDI.Cent note number

FilDir - returns the directory of a file path

FileToPvsBuf - Writes an audio file to a pvs buffer

FilNam - returns the name of a file path

FilSuf - returns the suffix of a filename or path, optional in lower case

findPowerOfTwo - Given a value in seconds, finds a power of two size equal to or greater than it in samples

flip - Flips an incoming floating point value at k-rate.

FreqByCentTab - frequency calculation of a step of a scale which is defined by a list of cent values

FreqByEqScale - frequency calculation for one step of an equal tempered scale

FreqByRatioTab - frequency calculation of a step of a scale which is defined by a list of proportions

ftreverse - reverses an ftable's contents in place at k-rate

gainslider - Logarithmic gain slider

getFrequency - Returns frequency whether being passed in pch or frequency

hysteresis - Implements classic 2-threshold hysteresis. Useful for performance controllers.

KeyOnce - Returns '1' once if a certain key has been pressed or released.

KeyStay - Returns '1' as long as a certain key is hold.

LogCurve - Normalised logarithmic curve with variable steepness.

lowpass - A k-rate smoothing UDO that is useful for averaging performance controller data.

midiMonitor - Displays midi channel and control number information

MS2S - Converts a floating point number in the format min.sec to seconds

PfieldsToTable - Transfers score parameter fields to a function table

PhsEdge - Reports whether the upper or lower border of a phasor has been reached.

Scala - Scales an incoming a-signal from a certain range to another range.

scale - Scales incoming value to user-definable range. Similar to scale object found in popular dataflow languages.

Scali - Scales an incoming i-variable from a certain range to another range.

Scalk - Scales an incoming k-signal from a certain range to another range.

SinesToSSTI - returns a function table with one of the four standard waveforms, produced by the addition of harmonics

Stayed - Reports if a control signal has stayed at the same value for a certain time.

StrayElMem - Tests whether a string is contained as an element in an array-string

StrayGetEl - Gets one element from a string-array

StrayGetNum - Gets one number from a string-array

StrayLen - Returns the length of an array-string

StrayNumLen - Returns the length of numerical elements in an array-string

StrayNumMem - Tests whether a number is a member of an array-string

StrayNumSum - Adds the elements in a numerical array-string

StrayNumToFt - Converts a string-array which just consists of numbers or simple math expressions to a function table

StrayRemDup - Removes duplicates in an array-string

StrayRev - Reverses the elements of an array-string

StraySetEl - Inserts an element in an array-string at a certain position

StraySetNum - Inserts a number in an array-string at a certain position

StraySub - Returns a subset of elements in an array-string

StrNumP - tests whether a string is a numerical string

TableDump - Prints a function table with formatting options.

TableDumpSimp - prints the content of a table in a simple way

TableToSF - writes the content of a table to a soundfile

TabMem - Looks whether a number is in a function table

TabPermRand_i - Permutes the values of a function table randomly

TabRmDp - Removes duplicates from a function table

tieStatus - Returns the status of a note in a group of tied notes

Tuner - Tunes a given fundamental to a user-provided scale

Y_x4p_i - Calcucaltes a Y value from a given X and 2 pairs of X/Y points, at init-time

Y_x4p_k - Calcucaltes a Y value from a given X and 2 pairs of X/Y points, at k-time

Uncategorized

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boomerangPointer - Pointer to read a function table forwards then backwards or vice versa.

filterBank - Defines a bank of bandpass filters in parallel whose outputs can be scaled using a function table.

linearPointer - Pointer to read a function table linearly, forwards or backwards.

pvshift - Pitch shifting and spectral stretching with pvs streams

RecursiveDiskin - Alters kpitch and iskiptime each time it calls itself to create a little bit of texture.

sampleSlicer - Reads a function table in incremental slices.

sittinginaroom - A simple,recursive opcode that has pleasant effects. The name pretty much describes what it does.