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jack2 vs. jack1/zita vs. jack2+zita-a2j, performance differences

by Jonathan E. Brickman

Thought the below might be of interest to some. The last is the best :-) Hardware and clients identical, octo 4GHz, test load is one yoshimi with jack_keyboard driving by way of a passthrough mididings. ---------------------------- Item one is vanilla distro jack2, run like this: jack_control start jack_control ds alsa jack_control dps device hw:SB jack_control dps rate 48000 jack_control dps nperiods 2 jack_control dps period 128 jack_control dps midi-driver seq jack_control dps inchannels 2 jack_control dps outchannels 2 jack_control eps realtime true jack_control eps realtime-priority 50 jack_control eps clock-source 1 The above is as low in reported latency I could go, 5.33ms, using every optimization I know of via the Arch wiki and realtimeconfigquickscan and other sources. Running load-less, it gives me usage ranging 0.9 through 1.4%, usually hanging in at 1.3%. With the test load, it tends to sit at 10% and rise with stress. A few xruns every once in a while are inevitable, even when the test load is delivering only silence. Nice tone quality. ----------------------------- Item two is jack1-git, compiled with Zita libraries engaged, run like this: nohup schedtool -R -p 50 -e /usr/bin/jackd -A SB -R -c h -X alsa_midi -d dummy -r 48000 -p 32 & Reported latency is 2ms. Load-less, usage rating is 1.3% through 29%, usually hanging in at 1.4% or so. With the test load, it sits at 31.2% at silence. No xruns. But no actual sound came out :-) ----------------------------- Item three is jack1-git, Zita libraries present but not used, run like this: nohup schedtool -R -p 50 -e /usr/bin/jackd -R -c h -X alsa_midi -d dummy -r 48000 -p 32 & nohup schedtool -R -p 50 -e /usr/local/bin/zita-j2a -d hw:SB 2ms reported latency. Loadless usage is 20%. With test load, 25-33% at silence. No xruns. Distorted sound. ------------------------------ Item four is jack2 vanilla distro, run like this: jack_control start jack_control ds dummy jack_control dps rate 48000 jack_control dps nperiods 2 jack_control dps period 32 jack_control dps inchannels 2 jack_control dps outchannels 2 jack_control eps realtime true jack_control eps realtime-priority 50 jack_control eps clock-source 1 schedtool -R -p 50 -e /usr/bin/a2jmidid schedtool -R -p 50 -e /usr/local/bin/zita-j2a -d hw:SB 2ms reported latency. Loadless usage 3.8 to 4.3%. With triple test load (three Yoshimis which is actually SOP for this rig), 4.5-5.5% at silence. No xruns. Wonderful sound, and no xruns with that triple load being pushed. Will be starting rigorous testing at lower latencies soon, but I have an instrument which has to sing first :-) Jonathan E. Brickman Ponderworthy Music | jeb(a)ponderworthy.com | (785)233-9977 | http://ponderworthy.com

11 years, 7 months

Anyone used a Firewire-to-USB3 or ESATA adapter?

by david

My church has a 16-channel Presonus Firewire device that we're not currently using because (1) my laptop has no Firewire connector (the dead old one did), and (2) our sound tech's laptop has Windows 7 on it and apparently there's no Windows 7 device driver for his Firewire PC Card adapter. So I thought, maybe a Firewire<->USB adaptor would work. All we used the Presonus for is recording individual channels. Now I just record 2 channels of essentially-mono output from our mixing board, but I very much miss the ability to clean up and EQ individual instruments and mix them better (the volunteer sound people who frequently run our mixing board don't exactly have the greatest ears, plus the acoustics in our rented location aren't the best). My laptop has USB2 and USB3, plus an ESATA port. I see Amazon has a selection: Firewire to USB http://www.amazon.com/s?ie=UTF8&page=1&rh=n%3A172282%2Ck%3Afirewire%20to%20… Amazon doesn't seem to show a Firewire-ESATA adaptor. For desktop folk, they list this PCIe card (2 external ESATA, 2 external Firewire800/1394B, 1 internal 1394B, runs TI XIO2213 chipset): http://www.amazon.com/NitroAV-Fusion-FireWire800-Professional-Adapter/dp/B0… Unfair: There's an Apple Thunderbolt to FireWire Adapter! I guess that will be enough to keep Firewire alive in the pro audio world. -- David W. Jones gnome(a)hawaii.rr.com authenticity, honesty, community http://dancingtreefrog.com

11 years, 7 months

M-Audio MTRACK

by Kaza Kore

Looking to buy a new USB audio interface in the next couple of days as am at a place where I will be staying for a little while (some of you may remember my previous post about the cards available on Amazon India as I'm currently travelling.) Well had a look at Ebay and come acros the M-Audio MTRACK. Sure it should be Linux compatible as it claims to be Class Compliant but I have a question about the headphone output which isn't answered specifically in the manual or FAQ. Can anybody confirm whether it is a duplicate of the Main output audio? Or if it is individually configurable at all? I suspect the former, but I have been happily surprised in the past, finding a headphone output to actually be a stereo output of its own, rather than a Master duplicate. Feel this very unlikely in the case but thought I would ask just in case anybody knows (or wants to warn me off for other reasons)... http://www.m-audio.com/images/global/manuals/M-Track_-_User_Guide_-_v1.1.pdf http://www.m-audio.com/products/en_us/MTrack.html

11 years, 7 months

Fwd: Music made in Linux - A song from an hobbyst

by Carlo Ascani

2014-04-16 20:52 GMT+02:00 F. Silvain <silvain(a)freeshell.de>: > Did you use a real analogue drum machine or are those sounds from a software > synth? Also what tool did you use for the effect sound? The electronic drums are samples played by hydrogen and processed by plugins (calf mostly). On the second part the real drum mixes with those electronic samples. I used mostly calf plugins (eqs, comps and reverbs), and a couple of effects from guitarix (distorsion and tube screamer) > Thank you again. That's a pleasure to share things with you guys! > ... > > Ta-ta > ---- > Ffanci > * Internet: http://freeshell.de/~silvain -- Carlo Ascani | carlorat.me skype: carloratm -- Carlo Ascani | carlorat.me skype: carloratm

11 years, 7 months

[LAA] Guitarix 0.29.0 released

by hermann meyer

The Guitarix developers proudly present Guitarix release 0.29.0 For the uninitiated, Guitarix is a tube amplifier simulation for jack, with effect modules and an additional stereo effect chain. Among with a couple changes in the source and some bug-fixes, this relase comes with a couple of new plugs (gx & LV2), were most of them comes from our new Development Member Fedor Uporov. The Simulation plugs been developed with the new Analog Circuit Simulation Toolkit by Andreas Degert. new plugs: * Record Mono/Stereo (gx) * JCM800PRE (Preamp simulation) (gx) * GCB_95 (WahWah simulation) (gx) * Duck Delay Mono/Stereo (gx / LV2) * Reverse Delay (gx) * Graphic EQ (gx / LV2) * Ring Modulator Mono/Stereo (gx) * Plate Reverb (gx) * Panorama Enhancer (gx) * Bass Enhancer (gx) * BarkGraphicEQ (24band LV2) Please refer to our project page for more information: http://guitarix.sourceforge.net/ Download Site: http://sourceforge.net/projects/guitarix/ Forum: http://guitarix.sourceforge.net/forum/ Please consider visiting our forum or leaving a message on guitarix-developer(a)lists.sourceforge.net <mailto:guitarix-developer@lists.sourceforge.net>

11 years, 7 months

Music made in Linux - A song from an hobbyst

by Carlo Ascani

Hi, I have just uploaded a song made entirely in Linux. The links: on bandcamp - https://lotfi.bandcamp.com/track/fulci direct download - http://carlorat.me/download/fulci.flac I have uploaded the full Ardour 3 project on bitbucket, it contains all the stems without processing. https://bitbucket.org/carloratm/fulci/src Please, feel free to open it and remix! All audio data is under a Creative Commons By Share-Alike license (see COPYING) And now, just a couple of words about the song with some credits: - the original idea was composed using Renoise - the speech you can hear is Lucio Fulci, an Italian director - the bass is played and recorded by Lorenzo Cecchi on linux - the analogue drums was played by me and recorded on linux by Lorenzo Cecchi - the piano was played by frate (http://amanitaphalloides.bandcamp.com/) - the mixing has been done by me, using Ardour 3. I am in no way a professionist neither an expert. I did it just for fun, I hope you enoy it. -- Carlo Ascani | carlorat.me skype: carloratm

11 years, 7 months

10 artists who used tech to make better music

by david

http://www.techrepublic.com/pictures/10-tech-savvy-musicians/ Note: May not work in Firefox. It didn't work in FF for Windows at work even after I allowed all scripts to run. Other folk complained in the comments about it not working in Firefox. Don't know if it works in Chrome or Konqueror. It works in Qupzilla but gives an SSL certificate error every time you click on it. -- David W. Jones gnome(a)hawaii.rr.com authenticity, honesty, community http://dancingtreefrog.com

11 years, 7 months

Re: [LAU] chord in trackers

by Kjetil Matheussen

On Wed, Apr 16, 2014 at 9:27 AM, Kjetil Matheussen <k.s.matheussen(a)gmail.com > wrote: > rosea grammostola: > >> > > >> > Hi, >> >> Playing with Radium a bit, so far so good. But how do you Tracker-guys add >> chords to your music? >> >> > Hi, I don't know whether you are only asking about trackers > in general, or if you are asking about Radium as well (which > may, or may not, be a tracker). > > But at least in Radium, you add polyphonic notes by holding > left shift while adding notes. > > But to be honest, I've never used this feature myself. I always > use several monophonic tracks instead. It's a nice feature > when importing midi files though. > > >

11 years, 7 months

Re: [LAU] Linux-audio-user Digest, Vol 86, Issue 12

by Kjetil Matheussen

rosea grammostola: > > Hi, > > Playing with Radium a bit, so far so good. But how do you Tracker-guys add > chords to your music? > > Hi, I don't know whether you are only asking about trackers in general, or if you are asking about Radium as well (which may, or may not, be a tracker). But at least in Radium, you add polyphonic notes by holding left shift while adding notes. But to be honest, I've never used this feature myself. I always use several monophonic tracks instead. It's a nice feature when importing midi files though.

11 years, 7 months

Super performance incl. low latency with zita-a2j

by Jonathan E. Brickman

I read about zita-ajbridge: http://kokkinizita.linuxaudio.org/linuxaudio/zita-ajbridge-doc/quickguide.h… Set Jack to use its dummy driver, and then (in background) run zita-a2j for output and/or zita-j2a for input, and then ignore the 'system' input and output ports and use the Zita ports. I went from 5.33ms to 1.33ms latency, and from occasional xruns to zero, and even with that my jackd usage percent is cut in half! Shocking. And that's three Yoshimis simultaneously. :-) I am tempted to giggle, but I am happier than that!!! The only partial catch was MIDI; without the ALSA driver for Jack, one does not have Jack MIDI :-) Unless, of course, one uses a2jmidid, so that's what I'm doing. With such a small Jack period, the extra period for a2jmidid is not an issue. Just had to report, and congratulate, and thank, everyone involved!!!!! Jonathan E. Brickman Ponderworthy Music | jeb(a)ponderworthy.com | (785)233-9977 | http://ponderworthy.com

11 years, 7 months

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