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[LAA] Programming LV2 Music Production Plugins Tutorial Series II

by Sven Jaehnichen

Hi, a story to continue. I'll release a second block of video tutorials about LV2 plugin programming from the scratch. For everybody who wants to make his/her own plugins. This time about graphical user interfaces. I'll show you: * the LV2 way to go, with turtle and C/C++, * toolkits and the pitfalls, * some of the toolkits we can use, and * finally how to make UIs for the plugins we made before. Every Friday, for the next some 10 weeks. Starting with this announcement video: https://youtu.be/7mCLDBBXajU See you on Friday Sven

2 years, 3 months

SoundTracker 1.0.4-pre1 released

by Yury Alyaev

Hi all, I just have released SoundTracker v1.0.4-pre1. I've decided to make a feature-freeze at this point, this means that 1.0.4 will have no new features comparing to this pre-release, only fixes and small improvements if something will be found inconvenient. So I ask everyone who has interest in SoundTracker to test this release. Here are main features of the 1.0.4-pre1 release comparing to 1.0.3: * General: - Full-screen mode - Volume of all samples of an instrument / all samples in the module can be set to a value, not only gained. Also all samples panning can be adjusted. These functions can also modify the explicitly given values of volume / panning of notes in patterns - Improved compatibility with FastTracker, also MOD files are played more correctly - Unused patterns are listed in the Pattern Sequence Editor - Sampling rate can be specified while saving a sample as WAV - New module optimizer with many control parameters * Track Editor: - Moving notes up / down is implemented * Sample Editor: - External programs can be used for samples processing. The interaction between such a program is described using XML spec, no ST recompiling required - The whole sample is drawn after recording - Exponential / reverse exponential volume fade transients * Instrument Editor: - Envelope inversion and shifting is implemented SoundTracker download page: https://sourceforge.net/projects/soundtracker/files/ Regards, Yury.

2 years, 3 months

Timed MIDI event handling

by Jeanette C.

Hey hey, I want to record MIDI into a sequencer application, using RtMidi. My understanding is: inside that application's tracks events are directly stamped with delta times, measured in ticks, since the last event in that track. Internally the sequencer runs a clock at a high rate (480PPQ or higher). It's probably best to "quantise" events to that internal clock while they are recorded. So the track object, with its connected MIDI input device, must be linked to the clock, which will wake up, whenever it is time for a tick. Linked meaning there must be some way to exchange relevant info (one of them owning a reference, callback, shared data, ...) If that basic, and simplified, principle is sound. Which solutions have been proven feasible to achieve that? For example: make every active track a thread and have a global mutex? Each track registers a callback function with the clock to store events. ...? RtMidi's input object (RtMidiIn) offers to register a callback function, that will be called with a received MIDI message, when input is available. Such messages could be stored in a container and be delivered when it's tick time. -- So again, a track might own a reference to the Clock thread object and query the current tick count since the last record start command and use that information to calculate the correct delta. Not sure though, whether that might raise issues with execution times. Using an atomic variable as a tick counter will avoid having to use mutex locks, at least. Is there any practical advice? Something based on experience? A good read? Best wishes and thanks, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c But now I'm stronger than yesterday <3 (Britney Spears)

2 years, 3 months

Calculating logarithmic curve for controller automation

by Jeanette C.

Hey hey, how is a logarithmic curve usually programmed in a DAW or sequencer? Do you scale the values of (log1) to log(2) to the desired range and stretch it over time? Do you ajudst steepness by either using more less of the log function or changing both values like log(20) to log(21)? I'm sure there are many ways to do it, but I'd assume that there are a few "classic" ways to approach this with anything from controller "automation" to envelope curve settings to ... I'd appreciate any hints or simple examples from software practise. Best wishes and thanks, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c Baby, take the time to realize I'm not the kind to sacrifice <3 (Britney Spears)

2 years, 3 months

Tempo change functions.

by Fons Adriaensen

Hello all, What exactly is meant by a linear or exponential tempo change ? Is the tempo a lin/exp function of time, or of score position ? A bit of algebra leads to this: Let t = time (seconds) p = score position (beats) v = tempo (beats / second) [1] We have v = dp / dt # by definition If v is a linear function of t, then v (p) = square root of a linear fuction of p If v is a exponential function of t, then v (p) = a linear function of p if v is a linear function of p then v (t) = an exponential function of t If v is an exponential function of p, then v (t) = inverse of a linear function of t So there is plenty of room for confusion... [1] Using SI units :-) Ciao, -- FA

2 years, 3 months

Admissable clock inaccuracy for MIDI

by Jeanette C.

Hey hey, I'm experimenting with c++ trying to program something nice for MIDI. I'm now experimenting with clocks, using both the standard c++ chrono library and the boost chrono library. My example program sets a desired delta between ticks of 250ms. I see that there is a difference, since Boost chrono can also use pthread thread parameters foor realtime scheduling and priorities. With the standard chrono and thread library my ticks are usually out by anything between 150.000 to 290.000 nanoseconds. Using boost a tick is out anything between 110.000 to 124.000 nanoseconds. Yes, much better. But, assuming that I correct the drift, does it make a difference for MIDI instruments? I know one of my MIDI instruments with a clock sync'able delay can be rather touchy with MIDI clocks, but are there good estimated guidelines experience values how precise ticks should be? Best wishes and thanks for any help, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c Top down, on the strip Lookin' in the mirror I'm checkin' out my lipstick <3 (Britney Spears)

2 years, 3 months

GRAME and Faust selected for Google Summer of Code 2023

by Stéphane Letz

Hi All, GRAME and Faust are selected for Google Summer of Code 2023: https://summerofcode.withgoogle.com/programs/2023/organizations/grame Projets ideas here: https://github.com/grame-cncm/faustideas Contributions welcome ! Stéphane

2 years, 3 months

update (again)

by Fons Adriaensen

Hello all, Just hours after the release of zita-resampler-1.10.0 yesterday, a new bug was reported, not in the library but in the zresample application. This is now fixed in 1.10.1 Ciao, -- FA

2 years, 3 months

updates

by Fons Adriaensen

Hello all, Updates now available on <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html> ebumeter-0.5.1.tar.xz zita-resampler-1.10.0.tar.xz Ciao, -- FA

2 years, 3 months

Text editor with new views in separate windows (not tabs or split views)

by Will Godfrey

Up till now I used Kwrite, but in recent versions this now only supports split views and tabs, and no longer new views in a new window. Separate windows in my preferred style, and I find I can work much faster and more accurately that way. Does anyone know of a text editor that still does this? I've not been able to identify anything on the usual search engines, nor with Wikipedia :( -- Will J Godfrey {apparently now an 'elderly'} https://willgodfrey.bandcamp.com/ http://yoshimi.github.io Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

2 years, 3 months

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Linux-audio-dev