Linux-audio-user

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20639 discussions

[linux-audio-user] Re: VST Server and such...

by Kjetil Svalastog Matheussen

> > I can't seem to leave well enuf alone! > > Trying to get vstserver up on my MDK 9.2 machine. > > Installed RPM's from Thacs. Installed as root. Copied my '.dll' VST > plugs to a directory. Set "VST_PATH" variable to that directory. > > When I run VSTserver from a console it just sits saying "VSTSERVER/main: > vstserver 0.3.1 has started. Waitng for requests" > > Now what? How do I interface VST plugs with a typical LADSPA host for > example? > I would guess that you should install Thacs ladspavst RPM to access vstplugins as ladspaplugins. --

21 years, 5 months

[linux-audio-user] hardware MIDI support

by Julien Pierre

Hi, I have a Roland UM-4 (Super MPU64) 4-port USB MIDI interface. I would like to get it to work under Mandrake (10.0 rc1). Currently, it doesn't seem that the ALSA build that comes with it has any drivers for USB MIDI. scandrake actually thinks the MPU64 is a scanner ... Is there any hope of getting this interface to work ? If so, how ? And what sequencer program should I use to record MIDI from a MIDI keyboard, and playback to MIDI external sound modules ? Thanks.

21 years, 5 months

[linux-audio-user] VST Server and such...

by Russell Hanaghan

I can't seem to leave well enuf alone! Trying to get vstserver up on my MDK 9.2 machine. Installed RPM's from Thacs. Installed as root. Copied my '.dll' VST plugs to a directory. Set "VST_PATH" variable to that directory. When I run VSTserver from a console it just sits saying "VSTSERVER/main: vstserver 0.3.1 has started. Waitng for requests" Now what? How do I interface VST plugs with a typical LADSPA host for example? THnx

21 years, 5 months

[linux-audio-user] Laptop tuning

by Arnold Krille

Hi folks, I am trying to make my 2 year old laptop fit for live-usage. Currently I am stuck at the 50ms latency border... I am using kernel 2.6.3-gentoo-r1, have preemption enabled and run jackd and every accessing app as root. I spent a day tuning my hd but there is no speed improvment so far. When I try to run jackd with less than 50ms latency sound is garbled and broken... I am using the builtin maestro3 for audio and an Edirol UM-2 for MIDI. Which other things did I miss? Where is room for speed improvements? Thanks in advance, Arnold -- Get my public-key from pgp.mit.edu or pgp.uni-mainz.de --- Hi, I am a .signature virus. Please copy me into your ~/.signature and send me to all your contacts. After a month or so log in as root and do a rm / -rf. Or ask your administrator to do so...

21 years, 5 months

[linux-audio-user] Alsa Modular Synth LADSPA plugs, etc..

by Russell Hanaghan

Looking for a harmonizer or pitch shifter plug for vocals...are there any specific plugins used for vocal harmony / vocoder stuff that are not part of the CMT or SWH packages? Steve? How about a zillion dollars to write one??? :)) The "high quality" pitch shifter seems to Segfault AMS as soon as I patch the output. Russell

21 years, 5 months

[linux-audio-user] Re: Alsa not working in new 2.6.* kernel

by David Baron

1. All that stuff which was in modules.conf now goes elsewhere: modprobe.conf or modules.conf.alsa. /etc/modprobe.d/alsa is auto-generated but you may need to add your non-autodetected devices. Check with other for most correct place to add then. I actually have it in both. Those /etc/alsa/modutils/ items are, I believe, relevant to the old kernel. 2. Make sure nothing is loading OSS modules. If you do not have them compiled in the kernel, then they are not there. Some folks run "discover", and handy utiltity (Knoppix does this as well) and this load OSS drivers if they are around. 3. If you are using USB devices, you need to have uhci-hcd loaded, ie. in /etc/modules. Note that I am having problems with this module (which replaces usb-uhci used in older kenrels).

21 years, 5 months

[linux-audio-user] [ANN] amSynth 1.0.0

by nick

amSynth - Analogue Modelling SYNTHesizer **************************************** http://amsynthe.sourceforge.net/amSynth amSynth 1.0.0 is now available!! Get the source code at http://prdownloads.sourceforge.net/amsynthe/amSynth-1.0.0.tar.gz?download Share your lovely presets on the Noizefarm! : http://devdsp.net/index.pl?main=noizefarm&filetype=5 Changes in this release include: * build fixes on alsa 1.0.x * cleaned up some internals for efficiency Enjoy! (and any problems with it please get in touch so I can fix them, details on website) -Nick d-.-b -- nixx(a)nixx.org.uk | amSynth lead developer JabberID: nixx(a)jabber.org | http://amsynthe.sf.net

21 years, 5 months

[linux-audio-user] Advice needed re: latency tuning/optimization, esp. video

by Chris Metzler

Hi. I'm looking for some advice on how to deal with latency introduced by graphics activity. My setup: AMD Athlon XP 2000+ ASus A7V333 Raid+ Motherboard 1 GB Corsair CAS2 PC2700 RAM Creative SBLive 5.1 sound card Matrox Millenium G550 video card, AGP4x, 32MB RAM 1 WD800JB IDE disk (80 GB, 8 MB cache); 4 WD1200JB IDE disks (120 GB, 8 MB cache each) Kernel 2.4.23 + preempt + lowlatency, XFree86 4.2.1 The plan for the four 120GB disks right now is to use pairs as RAID0 (striped) 240 GB disks, for speed; then to have one pair mirror the other (RAID1), for safety. I thought about doing RAID5 with all four but decided against. But I haven't set that up yet, and right now everything is living on the 80GB disk. The sound card shares IRQ 10 with the USB2 bus; but I have no USB devices of any sort. On IRQ 9 are two of my four IDE channels. As noted above, I patched my Debian 2.4.23 kernel with Robert Love's preempt patch and Andrew Morton's low-latency patch. I then went looking for test software to see what my latency numbers looked like. I found http://www.gardena.net/benno/linux/audio/ and the low-latency test software there (from 2000). I don't know if that's the best software to use, but that's what I found. It doesn't have much documentation, so I didn't really know what were the best number and size of audio fragments to use in the tests; so I just used the same that was written in the docs (three fragments, each 256 bytes). xscreensaver was disabled for the test. The test results were rather interesting. My latency numbers looked really good for procfs stress, and disk read/write/copy stress. In each case except for disk writes, the max latency only 1.6 ms, only 0.15 ms above the fragment latency of 1.45ms (which is found, presumably, by taking 44.1kHz * 2 channels * 2 bytes and dividing it into 256 bytes/fragment). For disk writes, the maximum latency got as high as 2.2 ms because of spikes on just two fragments. Anyway, that all seems fairly good to me, based on my very limited understanding of all this. But the X11 stress test was a different matter. There, my max latency was 18.4ms, with over 1500 overruns. While 96.25% of the reps came in within 1ms of the fragment latency, and 98% came in within 2ms, there were still enough big excursions to cause audible drop-outs/popping in the output. So it seems that while my latency numbers are generally good, video stuff can cause significant problems. This matches my experience, which is that I see significant xruns in JACK (50-70ms) if I minimize or open a window, or move a window, etc. This result surprises me. I'm using a video card that's supposedly very very good at 2D stuff -- indeed, it's the video card that RME recommended as recently as last year as their card of choice for audio workstations. It's definitely open at AGP 4x (XF86 wants to open it at 1x unless you explicitly say in the config file that you want 4x). 32 MB isn't a huge amount of video RAM, but I would think would be fine for 2D stuff. So what gives? Does anyone have advice on something to try? Is there something here I'm missing (likely, since I'm really really new to this stuff)? Are there tweaks to X11 I don't know about? Other than minimizing use of the GUI (which I'd be trying to do while using audio apps anyway), how can I bring the sensitivity to video stuff down? Other than kernel patching, watching relative IRQ priorities, and killing unneeded apps, are there any other tricks I might wanna consider? Thanks for any advice. -c -- Chris Metzler cmetzler(a)speakeasy.snip-me.net (remove "snip-me." to email) "As a child I understood how to give; I have forgotten this grace since I have become civilized." - Chief Luther Standing Bear

21 years, 5 months

[linux-audio-user] 1U" music PCs

by Steve Harris

http://www.coyoterd.com/musican.htm Runs Windows ME (yuk!) out of the box, but I'm guessing you could rebuild it into a linux box. - Steve

21 years, 5 months

[linux-audio-user] Live Laptop Linux FX processor...

by Russell Hanaghan

HAL continues to grow! :) So I got my Dell Laptop sorted now. I have embellished the setup by putting it on my CII Docking station which has 2 PCI slots. I had a SB Live card and bought another. I have them now tied together via .asoundrc file and running stable as 4 ins 4 outs w/Jack. Can't get lower than 512 but thats ok. Still using Ardour as my interface for plugins... Here's the next question... I'm thinking about the possibilities. Can I get midi control of plugins via Ardour or Jack rack or other app so I can use a midi controller footswitch to turn FX on or off from a footswitch? My thought is that other than just reverb on vocals, I could set up vocoder and delay stuff for harmonies, etc. The midi control needs only to be "on/off" and also to be able to leave more than one effect on at a time. R~

21 years, 5 months

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Linux-audio-user