LyonPotpourri is a collection of externals developed for the creation and performance of computer music. The externals were originally developed for Max/MSP, and then extended into hybrid code that could compile for both Max/MSP and Pd. As of version 3.0, LyonPotpourri has diverged into separate Pd and Max/MSP versions. The Pd version is available here.

LyonPotpourri is Copyright Eric Lyon, 1999-2023, and is covered under the MIT license. Please see the accompanying License file for details.

• adsr~ a simple ADSR envelope that can be click triggered
• bashfest~ a click driven buffer player with randomized DSP
• buffet~ provides operations on a stored buffer
• buffi~ interpolates between the contents of two buffers
• bvplay~ selective playback from a stored buffer with enveloping and increment control
• chameleon~ an oracular sound processor
• channel~ access to a precise address in the signal vector
• chopper~ munging loop playback from a buffer
• clean_selector~ like selector~ but crossfades when switching channels
• click2float~ translates a signal click to a float message
• clickhold~ sample and hold a click
• convolver~ non-real-time convolution with impulses of arbitrary size
• distortion~ lookup function distortion
• dmach~ pattern based sample accurate drum machine prototype
• epluribus~ combine several signal inputs to a single output based on min or max sample value
• expflam~ converts a click to an exponential flam click pattern
• flanjah~ simple flanger
• function~ write various functions into an array
• granola~ granular pitch scaling
• granule~ granular synthesis module reading from a stored waveform in a buffer
• granulesf~ granular synthesis module reading from a soundfile in a buffer
• kbuffer~ low sampling rate buffer to capture gestures
• killdc~ DC block filter
• latch~ sustain an incoming click with sample-accurate timing
• magfreq_analysis~ transforms a time domain signal to a magnitude/frequency spectrum
• markov~ implements a first order Markov chain
• mask~ a click driven pattern sequencer
• npan~ power-panning to an arbitrary number of output channels
• oscil~ oscillator with flexible waveform specification
• phasemod~ phase modulated waveform
• player~ click driven buffer player that can sustain multiple iterations
• pulser~ pulse wave generated by additive synthesis
• quadpanin~ pan an incoming sound within a quadraphonic plane
• rotapan~ rotate an array of input channels to the same number of output channels
• rtrig~ generates random click triggers
• samm~ sample accurate multiple metronomes, with click signal articulation
• sarec~ sample accurate recording
• sel~ sample-accurate implementation of the sel algorithm
• shoehorn~ collapse from a larger number to a smaller number of audio channels
• sigseq~ signal level numerical sequencer
• splitbank~ - split an incoming sound into complementary, independently tunable spectra
• splitspec~ split an incoming sound into complementary spectra
• squash~ implementation of a compression algorithm by Christopher Penrose
• stutter~ stuttering playback from a buffer
• vdb~ a delay line using an array for storage (no vector limit on feedback delaytime)
• vdp~ a simple, self-contained delay unit
• waveshape~ a Chebychev function lookup waveshaper

I hope you have as much fun using these externals as I did creating and using them in my own compositions.

Eric Lyon
ericlyon@vt.edu
School of Performing Arts | Music
Institute for Creativity, Arts, and Technology
Virginia Tech.

January 9, 2023