Linux-audio-dev June 2005

linux-audio-dev@lists.linuxaudio.org

120 participants
101 discussions

Re: [linux-audio-dev] 3D fft analysis program

by Downer

> I'm hoping that you're thinking of a realtime display, in which the > peaks roll off to create a true waterfall effect. Baudline (http://www.baudline.com) is a fantastic viewer that does fft cascade. I've used it for a couple of years, and it is great for figuring out how different sounds "work", and it has an oscilloscope-type display as well. Cheers, Jason Downer

18 years, 6 months

[linux-audio-dev] Drum synth

by Dmitry Baikov

Hello. I finally started making my pet music project and realized I need a drum synth to make some cool sounds. psindustrializer is good but also need some tr-909-style sounds. I remeber from my old windoze days I used a nice piece of software called Stomper. Does anybody know any software for linux with comparable capabilities? Or we need to write one? Stomper does not work under wine :( Thanks.

18 years, 6 months

[linux-audio-dev] Re: Drum synth

by Juhana Sadeharju

Hello. I had a couple of articles on drum synths. Check ftp://ftp.funet.fi/pub/sci/audio/devel/lad/drumsynth/ I built the circuit in a00*.jpg at the time when this article was fresh. The article b00*jpg mentions an earlier article. I will check that out at library. Hmm.. I coded a drum synth for Commodore VIC-20 at the time. VIC provided an audio chip with three oscillators, noise, and a common volume if I remember correctly. What I did was to modulate osc pitch and volume parameters with a fast and accurate (compared to Basic) assembly code. The drum sounds were assigned to the keys. This was about 1984, inspired by Yamaha's digital RX drum synths, not by analog drums. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

18 years, 6 months

[linux-audio-dev] Re: lad design patterns

by Juhana Sadeharju

>From: "Levi D. Burton" <ldb(a)puresimplicity.net> > >does the idea of documenting various lad design patterns make >sense to anyone? Such "LAD Gems" doc would be much needed here too. (For audio dsp gems, take a look at "musicdsp.org".) I would appreciate if somebody would take a look at Ardour and document best gems found there. E.g., the GUI and audio thread separation and start up sequences. Likewise for Linuxsampler and one of its GUI frontends. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

18 years, 9 months

Re: [linux-audio-dev] Best-performing Linux-friendly MIDI interfaces?

by Jay Vaughan

>Good to see someone other than Grame' guys try to "push" MidiShare.... ((: well, i'm only pushing because i'm using it, and i can't use ALSA. :) >But Jay, MidiShare cannot help in terms of synchronizing MIDI with >audio at the sample level..... MidiShare events are 1 millisecond >time stamped. yes, i understand that now .. i initially mis-understood pd's idea on this, since under OSX, MidiShare is 'sync'ed' using an Audio timer.. but, it would in fact be interesting if MidiShare had a new 'Audio Event' type added to it, from the standpoint of timestamp'ed events .. thats feasible, i think .. of course, this would only be relevant if one was already using MidiShare, but it would be a nice addition to what I consider a very clean and productive API .. /me goes off to prepare an "AudioShare" patch, heh heh .. >But well the Linux official API is now ALSA, and the OSX official >API is CoreMidi..... and we have to live with that. what makes an API 'official' under Linux, anyway? in my opinion, the old maxim, "use what works" applies .. and ALSA has proven to be a very difficult and annoying thing to get set up and working (witness jwz' recent terror) .. while MidiShare has (for the most part) been smooth and dreamy. but .. ymmv, yo. -- ; Jay Vaughan

19 years, 4 months

[linux-audio-dev] Audigy 2 ZS Notebook drivers

by Melanie

Hi, i have searched the web and the ALSA pages and found very little information concerning the status of the development efforts, if any, and who might be interested. This card seems like a good means to hook a notebook into a DJ mixer, splitting the output into 2 or 3 stereo outs. I am very interested in such a driver, but I dud find a reference to a kernel PCMCIA bug on the ALSA sound card list. How much of a showstopper is it? Is there any problem that could be fixed by throwing money at it? And, if it is a money problem, if the funds were available, how long would it take for a driver to be completed? My minimum requirement would be a driver that would support the Audigy 2 ZS Notebook as well as an Audigy Platimun or SB Live! is supported. Melanie

19 years, 4 months

[linux-audio-dev] FM, Phase Modulation and The Wiki

by Jens M Andreasen

Hi! I am trying to correct some factual errors in wikipedia regarding FM synthesis (aka phase modulation.) The page in qustion is here: http://en.wikipedia.org/wiki/Frequency_modulation_synthesis My current corrections are in italics. Further corrections appreciated I am currently looking at the Casio section near the end (regarding phase distortion.) Wasn't this technique developed way back in the 60's by french academics? mvh // Jens M Andreasen (and yes, somebody ought to rewrite the whole page from scratch :)) --

19 years, 5 months

[linux-audio-dev] [WIP] hdsposc

by Mario Lang

Hi. Since I finally ordered my Multiface, I also started to write a small program which I am going to need since hdspconf and hdspmixer are both GUI only. The idea: hdsposc will offer the RME mixer and the metering functionality via OSC. Why do I write this mail? I'd like to know if someone else could also make use of this tool. If so, I'd like to hear your input what you'd want to exactly do with it. If no one responds, I'll save coding time by ONLY implementing the Multiface (since thats what I can test) and probably not polish it much, since what I need is probably very basic. Oh, and BTW, during coding of hdsposc a question arose: Is it recommended practice to immediately close a hwdep device again after performing a single operation, or would it be OK to leave the hwdep handle open during runtime and only close it again on program shutdown? -- CYa, Mario

19 years, 5 months

[linux-audio-dev] linking multiple .o plugins into a single .so library

by Artemio

Hello all! I have a question regarding linking multiple plugins into a single library. if I do: $ ld -shared -o plugins.so plugins/*.o - then ld complains that g_psStereoDescriptor and g_psMonoDescriptor as well as _init and _fini functions are duplicate and does nothing. If I try: $ ld -shared -z muldefs -o plugins.so plugins/*.o - this does some wizardry on changing the duplicate functions names (_init and _fini) and in the host only the last plugin in the .o files list is seen. As I understand I cannot change the names of _init and _fini because these are standard for libraries (or not?) and names of g_psStereoDescriptor and g_psMonoDescriptor are standard for a LADSPA plgin (or not?)... But what should I do? Or is is better to keep the plugins in separate .so files? Thanks very much! Artemiy.

19 years, 5 months

Re: [linux-audio-dev] jack_convolve-0.0.10, libconvolve-0.0.3 released

by Chris Cannam

Florian Schmidt: > P.S.: I am also currently working on a qt app which > uses libconvolve Any interest in making a DSSI plugin? Chris

19 years, 5 months

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Linux-audio-dev June 2005