The NEWS file (from the spectmorph source tree) contains the list of changes for each release.

SpectMorph 1.0.0 beta2

Updates for macOS

• Plugin user interface now works correctly on macOS 14 (#28).
• Update clang++ compiler version on macOS.
• Minimum supported macOS version is now macOS 11.

SpectMorph 1.0.0 beta1

New Features

• WavSource: support two formant preserving algorithms for repitching vocals.
• New operators:
  • KeyTrack - can be used to combine instruments by note range.
  • Envelope - to generate arbitary modulation envelopes.
• User defined curve editor for KeyTrack, Envelope and LFO.
• Add presets using the new operators:
  • KeyTrack Choir Ah/Oh
  • StringBrass Fusion
• JACK CC values are now interpreted per channel (allows polyphonic modulation).
• Support double click to reset properties to default value.

Fixes

• Apply midi channel bend to new voices.
• Make portamento affect filter cutoff key tracking.
• Fix problems with WavSource paths stored by LV2 plugin (make Ardour archives work).
• Fix getting the initial click events / focus plugin UI on macOS under Bitwig.
• Fix invalid access to past last vector element (#24).
• Make PandaResampler work without problems in ASAN builds.
• Refactor leak debugger to fix possible crashes caused by global destructors.
• Do not ship sample data in "1 Instrument WavSource" preset.

Internals: Improvements

• Generate and store spectral envelopes in each AudioBlock for formant correction.
• Improve the strategy for portamento synthesis (more accurate and less CPU usage).
• Propagate portamento frequency to sources.
• Randomize start phase per default to improve "Harmonic Resynthesis" quality.
• JACK: use two audio outputs to be able to implement stereo support later on.
• Add fast vectorizable log2 approximation (based on Tims version from Anklang).
• Phases in LiveDecoder, IFFTSynth: change from float to uint for performance reasons.
• Various minor performance optimizations.
• Minor LV2 meta data updates (port groups, avoid port resizing extension).
• Use newer compilers: g++-14 for windows, g++-13 for static linux plugins.
• Support automatically downloading instruments from configure.
• Avoid using std::mutex in hard RT code.

Internals: Minor Changes

• Refactoring:
  • Deduplicate morphing code from MorphGrid and MorphLinear.
  • Use shared pointers for GenericIn/GenericOut classes (RAII).
  • Get rid of sm_clamp / sm_bound (-> std::clamp).
• Improve CI support (use debug-cxx, asan, ubsan, test static build, avoid fftw planning).
• Add post install test which tests audio output for all presets after installation.
• Validate LV2 feature arrays.
• Support user defined scripts in testmidisynth test.
• Improve error messages for preset loader.
• Build cleanups: remove libbse code, simplify Qt build (remove smsampleedit).
• Update CLAP version to 1.2.1.

SpectMorph 0.6.1

Instrument Editor

• Support click & drag sample to scroll & zoom (#22).
• Support stereo to mono conversion when loading stereo samples (#14).
• Add manual volume editing / normalization.
• Implement automatic selection triggered by midi.

New instruments

• Bass Flute
• Soprano Saxophone
• Clarinet, Bass Clarinet
• Tenor Trombone
• Viola, Double Bass
• Make samples and meta information for standard instruments available on github.

Improvements

• Support multiple banks for WavSources / instrument editor.
• Avoid allocations in DSP thread to be hard RT capable.
• Allow overriding analysis parameter for frame stepping to get higher time resolution.

Fixes

• Make UI work properly in Ableton Live (and possibly other hosts) on macOS.
• Fix UI scaling problem on M1 macOS builds.
• Fix crash if instrument editor is closed without any samples.
• Fix cases of undefined behaviour.
• Fix timing problems for long notes, reproduce long WavSource notes with exact tempo.
• Fix use-after-free for outdated control events.
• Fix freetype related memory leak.

SpectMorph 0.6.0

New features

• New, more flexible modulation system
• Added filter with different filter modes
• Provide visual feedback for modulated properties
• Provide signed .pkg installers for macOS (Intel and ARM)

CLAP Plugin

• Provide CLAP Plugin
• Support for per-voice modulation
• Support timestamped modulation/automation events

LV2 Plugin

• Support LV2 on all platforms
• Fix crashes triggered by Carla (absolute_path/abstract_path returning NULL)
• Support newer LV2 development headers

Minor Changes

• Support "Velocity" as modulation source
• Make pitch bend range configurable
• New Presets with filter: "Cheese Cake Bass", "Liquid Silver"
• Sort midi events by timestamp to workaround Bitwig bug
• Sliders now support shift+drag for fine editing
• Support for Apple Silicon
• Avoid crashes if XOpenIM / XCreateIC return NULL (#15).
• Fix statically linked plugin data directory location (works in flatpak apps now).
• Add dockerized MXE builds for windows, bump compiler version to gcc-12.
• Bump minimum C++ standard to C++17
• Fix build on RISC-V (#13)
• Use GitHub CI for Linux, macOS and Windows
• Change license from "LGPL v3 or later" to "LGPL v2.1 or later".
• Minor fixes and cleanups

Internals: Properties

• Add generic property handling
• Simplify load/save/gui for properties
• Support modulatable properties using ModulationList
• Add gui for editing property value and ModulationList
• MorphPlan is no longer ref-counted, just one instance per Project
• Introduced MorphOperatorConfig objects for cleaner/faster parameter updates

Internals: Filter

• Add two filter types: "Ladder" and "Sallen-Key" filter to output operator
• Integrated PandaResampler for SIMD 4x filter oversampling
• Support modulation with high time resolution for filter

Internals: UI Toolkit

• Support multiple update regions in UI toolkit
• Optimize drawing for UI toolkit
• Support "software sprites" for efficient visual feedback
• Map Ctrl+Left Click to Right Click on macOS

Internals: Optimizations

• Pass wav set pointers (instead of strings) to morph linear/grid/source.
• Avoid fmod() for phase truncation.
• Build using -ffast-math
• NotifyBuffer: fast dsp thread -> ui thread notifications (no malloc in dsp thread)
• Avoid allocations in dsp thread in many cases (retrigger, noise decoder process)
• Support optimized SIMD code on ARM (Apple Silicon), code from Peter Johnson (#11)

SpectMorph 0.5.2

• Support bpm/beat synchronization for LFO
  • new presets using beat sync LFO: Mars / Saturn
• Add WavSource custom position playback mode
• New Instruments: Sven Ah / Ih / Oh (another male human voice)
• Store data in XDG directories on Linux:
  • move ~/.spectmorph directory to $XDG_DATA_HOME/spectmorph
  • move ~/SpectMorph directory to $XDG_DOCUMENTS_DIR/SpectMorph
  • create $XDG_DOCUMENTS_DIR/SpectMorph directory when needed (on write)
  • backward compatibility: use ~/SpectMorph if it already exists
• Bump number of control inputs from 2 to 4
• Implemented midi CC control for smjack (General Purpose Controller 1..4)
• Fix crashes caused by dangling MorphOperator pointers
• Fix loading floating point wav files
• Minor fixes and cleanups

SpectMorph 0.5.1

• Add new LFO modes (saw, square, random)
• Support generic 64-bit linux binaries
  • new linux file selector (no longer needs Qt)
  • ship font for static build
• Fix crashes caused by fftw planner being used from multiple threads
• Ported all python2 code to python3
• Support midi all notes off
• Implement LV2 StateChanged
• French translation for smjack desktop file (Olivier Humbert)
• Thread race fix (JP Cimalando)
• Minor fixes and cleanups

SpectMorph 0.5.0

• Support user defined instruments
  • graphical instrument editor
  • new WavSource operator
• Make standard instrument set smaller (less download/disk usage)
• Graphical ADSR editor
• Added "SpectMorph User Manual" (online: html/pdf)
• Use different colors for active/used/unused operators
• LV2 now requires instance access feature
• Add file dialog wrapper shell scripts to work with some ardour bundles
• Integrate XML (pugixml) and ZIP (minizip) 3rd party code
• Minor fixes and cleanups

SpectMorph 0.4.1

• macOS is now supported: provide VST plugin for macOS >= 10.9
• Include instruments in source tarball and packages
• Install instruments to system-wide location
• New Instruments: Claudia Ah / Ih / Oh (female version of human voice)
• Improved tools for instrument building
  • support displaying tuning in sminspector
  • implement "smooth-tune" command for reducing vibrato from recordings
  • minor encoder fixes/cleanups
  • smlive now supports enable/disable noise
• VST plugin: fix automation in Cubase (define "effCanBeAutomated")
• UI: use Source A / Source B instead of Left Source / Right Source
• UI: update db label properly on grid instrument selection change
• Avoid exporting symbols that don't belong to the SpectMorph namespace
• Fix some LV2 ttl problems
• Fix locale related problems when using atof()
• Minor fixes and cleanups

SpectMorph 0.4.0

• Windows is now supported: provide 64-bit Windows VST plugin
• Plugin UI redesign
  • use pugl library for portability (uses GL + cairo) instead of Qt5
  • use categories for instruments
  • directly support instrument names in linear morphing
  • get rid of Qt5 dependency for libspectmorph, smjack, VST and LV2 plugins
  • UI now has "Zoom" feature to support higher DPI displays
• Use non-linear configurable new velocity -> volume mapping for midi
• New instrument: French Horn
• Improved tools for building custom instruments
  • tools are now installed by default
  • sminstbuilder files support new syntax for relative paths
  • encoder cache moved to ~/.cache/smenccache, which is created if necessary
  • use number of processors as default for jobs
• LPC/LSF support removed
• Some portability fixes for macOS (which however isn't supported yet)

SpectMorph 0.3.4

• Added optional ADSR Envelope
• Make LV2 and VST plugin stereo to allow supporting stereo in the future
• LV2 plugin description fixes
• Added about dialog to plugin/smjack UI
• Remove BEAST plugin (plugin code will be moved to BEAST)
• Fixed compilation for newer g++ >= 6 (std::fabs)
• Get rid of some malloc() calls in linear morphing

SpectMorph 0.3.3

• Added portamento:
  • VST: support MPE to perform per-voice pitch bend (can be used in Bitwig)
  • new portamento mono mode (all hosts)
• Added vibrato.
• Internal improvements:
  • better property abstraction for (non-linear) UI properties
  • updated polyphase interpolator (used for vibrato|portamento)
  • fixed a few problems when developing against spectmorph(ui) libs
  • don't link against Qt UI library when only QtCore is necessary
• Compile fixes for g++-6.3

SpectMorph 0.3.2

• Added new unison effect.
• New instruments: pan-flute, synth-saw.
• UI improvements:
  • support operator folding (to preserve screen space)
  • provide scrollbar if morph plan window height is large
  • repair operator move
• VST plugin crash fixed.
• No longer depend on BEAST/Rapicorn
  • use libsndfile for sound file I/O, added WavData API
  • refactoring, move libnobse code into SpectMorph
• Add icon/.desktop file for smjack
• Added debian package support.
• LPC/LSF morphing code updates - but now disabled by default

SpectMorph 0.3.1

• Added plugins for LV2 and VST api.
• New instruments: bassoon, cello, bass-trombone, reed-organ.
• Added different templates to get standard morph plans quickly.
• LV2|VST|JACK will start with default plan now (instead of empty plan).
• Standard instrument set location (~/.spectmorph/instruments/standard):
  • plan templates can refer to instruments in that directory without storing any absolute path (index will be instruments:standard)
  • in almost any case, loading instruments isn't necessary anymore
• Resize MorphPlanWindow automatically if operators are removed.
• Changed time alignment during morphing:
  • morphed sounds should starty at the beginning of the note (no extra latency)
  • Start marker for instrument notes no longer necessary
  • SpectMorphDelay plugin no longer necessary
• Some improvements for building new instruments:
  • make some smenc parameters configurable (--config option)
  • improvements to soundfont import
  • new fundamental frequency estimation for tune-all-frames
  • support global volume adjustment (instead of auto-volume)
• Various bugfixes.

SpectMorph 0.3.0

• Incompatible file format changes:
  • use 16-bit integer values for sine and noise data instead of floats to reduce file size on disk and in memory
  • introduce short_name & name field for instruments
  • changed the way noise is represented from total band energy to normalized noise level
• Use Qt5 for the GUI, instead of gtkmm.
• Added Grid Morph operator: allows morphing between more than two sources.
• Adapted code to work with newer beast (0.10.0) and rapicorn (0.16.0).
• Improved tests.
• Various bugfixes.
• Performance improvements.

SpectMorph 0.2.0

• implemented user defined morphing using a MorphPlan consisting of operators
  • graphical representation of the operators
  • graphical editing of the MorphPlan
  • implement actual morphing (in per-operator per-voice module object)
  • added MorphPlanSynth/MorphPlanVoice, which allow running MorphPlan's easily
  • added LPC (linear prediction) during encoding, and LPC/LSF based morphing
• BEAST plugin:
  • added GUI required for editing a MorphPlan
  • support four output channels, as well as twc control inputs
  • delay compensation plugin (to compensate SpectMorph delay)
• JACK client:
  • support GUI MorphPlan editing
• added sminspector (graphical tool for displaying SpectMorph instruments)
  • zoomable time/frequency view
  • configurable (FFT/CWT/LPC) time/frequency view transform parameters
  • spectrum, sample, LPC visualization
  • graphical loop point editing
  • allow storing changes in .smset files (for editing loop points)
  • play support via JACK
• improved smtool (old name: smextract); its now installed by default
  • lots of new commands (like "total-noise", "auto-volume", ...)
  • support .smset as input (in addition to .sm); command is executed on all .sm files in the .smset
• added shared libraries for gui and jack code
• new integrated memory leak debugger (to find missing delete's)
• support ping-pong loops
• doxygen API docs updates
• migrated man pages from Doxer to testbit.eu wiki (and use wikihtml2man.py)
• performance improvements

SpectMorph 0.1.1

• added tool for SoundFont (SF2) import: smsfimport
• file format changes
  • allow time index based loops (required for looped SoundFont presets)
  • allow stereo (multichannel) files in WavSets
  • store phase and magnitude seperately (instead of a sin+cos magnitude)
  • support multiple velocity layers
  • allow storing the original sample data for quality comparisions
  • optimize storage size for smset files if the same Audio file is reused more than once
• switch to 32 values for 32 perceptually spaced noise bands, instead of the old noise representation
• handle stereo (multichannel) files in smenc, smjack and beast plugin
• performance optimizations
  • LiveDecoder is now really fast, and can handle highly polyphonic synthesis in RT
  • sine synthesis is based on IFFT now
  • noise synthesis is a lot faster, too
  • where possible, use SSE operations in performance critical code
  • use FFTW for FFT, which is faster than gslfft
  • added fast float->int conversion on x86
  • smjack is a lot faster, now
• removed smenc -O2 setting, which was too slow for practical use
• introduced anti-alias filter in LiveDecoder
• cleanups, refactoring, bugfixes

SpectMorph 0.1.0

• file format changes
  • instruments based on more than one sample can be shipped as one single file
  • various performance optimizations
  • store data as little endian (since this is more likely to be the host endianness)
  • broken files or old files can be recognized and rejected
• automated tuning algorithm (smextract auto-tune)
• supported looping (for playing notes that is longer than original sample)
• added beast plugin for playing SpectMorph instruments
• added jack client for playing SpectMorph instruments
• added zero padding before start of a sample to get better initial frames
• compile with -Wall
• allow single file argument for smenc (output filename will be constructed with .sm extension)
• support setting smplay decoder mode via command line parameter
• refactoring, cleanups

SpectMorph 0.0.3

• added encoder algorithm to find attack envelope, this makes piano sound much more realistic
• introduced smwavset tool, which allows managing instruments consisting of many samples
  • encoding/decoding a set of samples
  • delta operation for comparing errors of sets of samples
• smextract can now provide an overview of how many bytes in an .sm file can be attributed to which fields
• documentation updates
• refactoring, cleanups

SpectMorph 0.0.2

• bugfixes
• include proper phases, so phase-correct reconstruction of samples is possible
• new programs:
  • smstrip - removes debugging information from SpectMorph model files
  • smextract - extracts data from SpectMorph models, for developers only for now
• added --no-noise / --no-sines switches for smplay
• added -s switch for smenc, to create stripped models
• use boost numeric bindings + lapack for ideal phase/magnitude estimation (smenc -O2) - slow!
• SSE optimizations and other speedups for fast phase/magnitude estimation (smenc -O1)
• use odd/centered FFT to be able to reconstruct phases from FFT data (smenc -O0)
• use different thresholding scheme for encoder, detecting more partials
• document API with doxygen
• move Encoder and other classes to libspectmorph
• added python binding, capable of reading SpectMorph model files
• added automated tests
• added manual pages for smenc, smplay, smvisualize and smstrip
• added overview document in docs directory

SpectMorph 0.0.1

• initial public release with three programs
  • smenc - builds model of a sample
  • smplay - resynthesizes sample from model
  • smvisualize - visualizes model