Re: [Hydrogen-devel] Suggestions for full Edrum Support
Am Wed, 15 Jun 2011 22:34:40 +0200 schrieb thijs van severen thijsvanseve...@gmail.com: would you be interested in writing down what you have created ? a bit like the description i made of my live setup (see http://hydrogen-music.org/hcms/node/29) I'll try to get around to do that. Also, I'll probably test the setup on a little school gig tomorrow. But what I again observed during playing yesterday... while you can play, also with others, there is some noticeable latency when you look for it. Well, a subtly strange feeling when concentrating on it. When not bothering and just playing, it's fine. So, my Roland drum brain is a bit quicker as the current combo of MIDI/USB Trigger pad and Hydrogen on the PC. Question is if the main source of latency is the trigger pad (unlikely) the MIDI/USB connection or the Linux driver/kernel side (quite possible) or hydrogen ... and that is a good point, IMHO. Hydrogen is not designed for quick live play, is it? I mean, it's great how it works at all, but I imagine that there can be room for improvement for responsiveness. Or ... or it could be the added delay of the MIDI filter, but seriously doubt that. The program does do hardly any computation and if the ALSA MIDI stack would introduce noticeable latency for the signal passing then it would be positively considered utter crap, wouldn't it? But perhaps it would be a good idea to run the filter with realtime priority, too. I think I'd need to measure the latency by monitoring time stamps of midi signals coming in and at the same time recording the produced output of hydrogen via JACK... correlate those somehow... are there perhaps ready solutions to diagnose this? There are people playing MIDI synths with linux, right? Alrighty then, Thomas. signature.asc Description: PGP signature -- Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev___ Hydrogen-devel mailing list Hydrogen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hydrogen-devel
Re: [Hydrogen-devel] Suggestions for full Edrum Support
On 23/06/11 08:17, Thomas Orgis wrote: So, my Roland drum brain is a bit quicker as the current combo of MIDI/USB Trigger pad and Hydrogen on the PC. Question is if the main source of latency is the trigger pad (unlikely) Not as unlikely as you think. My old drum brain (infamous Fame DD602) had a horrendous latency on its MIDI output. I've even noticed the difference hitting a bare piezo connected to the brain vs the same piezo enclosed in a mesh/foam pad. If you're using USB audio, it may add to the latency. I don't think Hydrogen is adding any noticable latency in itself. You might experiment with buffering/JACK settings to reduce the audio latency, and also compare a virtual piano keyboard on the PC with external MIDI input. Krzysztof -- Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev ___ Hydrogen-devel mailing list Hydrogen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hydrogen-devel
Re: [Hydrogen-devel] Suggestions for full Edrum Support
Am Thu, 23 Jun 2011 11:40:53 +0200 schrieb thijs van severen thijsvanseve...@gmail.com: @Thomas : what is your audio latency reported by jack? More below... On 23 Jun 2011 11:13, Krzysztof Foltman w...@foltman.com wrote: On 23/06/11 08:17, Thomas Orgis wrote: So, my Roland drum brain is a bit quicker as the current c... Not as unlikely as you think. My old drum brain (infamous Fame DD602) had a horrendous latency on its MIDI output. To clarify: I am comparing the MIDI setup with playing on a Roland TD-10 set, the Roland drum brain is not involved with Hydrogen. The MIDI data comes from an Alesis ControlPad which really is just a MIDI trigger, no drum brain involved. So I'd assume that since triggering MIDI events from hitting pads is the only purpose of the device, it does that without noticeable delay;-) But I can test that, connecting it as trigger to the Roland brain's MIDI input. If that shows clearly less latency, then I know something on the PC side is to blame. Heck... I can even connect the Alesis to the PC and route to a separate MIDI adapter into the Roland brain. If _that_ doesn't show the same latency, then Hydrogen is looking highly suspicious;-) And about JACK: I actaully got confused as I _think_ (talking of hunches here) that the latency improved while going from 3x64 to 3x256 or 2x512 periods ... or at least it didn't get _worse_. That, and the fact that you can rather nicely play guitar without noticing much of latency when using 3x256 or such on this laptop, suggests that JACK is not the source of the latency I feel there. But granted, the guitar play was with an USB audio interface ... the drumming was with the internal sound chip. But I'd be surprised if the USB interface had less latency than the internal chip. Alrighty then, Thomas. signature.asc Description: PGP signature -- Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev___ Hydrogen-devel mailing list Hydrogen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hydrogen-devel
Re: [Hydrogen-devel] Suggestions for full Edrum Support
On Thu, Jun 23, 2011 at 03:19:42PM +0200, Thomas Orgis wrote: Am Thu, 23 Jun 2011 11:40:53 +0200 schrieb thijs van severen thijsvanseve...@gmail.com: @Thomas : what is your audio latency reported by jack? In my experience, the latency configured for jack is the only noticeable latency on the system. I'd have to boot my kit to tell what my jack settings are, but the out of the box jack config on Fedora has fairly noticeable latency. Even on the very old hardware I use for my kit I was able to turn down the latency until I could not notice it. Actually, there is one other thing, if you are using USB sound cards for MIDI in and audio out, make sure they're not on the same USB bus. That caused unpleasant latency as well. Dave More below... On 23 Jun 2011 11:13, Krzysztof Foltman w...@foltman.com wrote: On 23/06/11 08:17, Thomas Orgis wrote: So, my Roland drum brain is a bit quicker as the current c... Not as unlikely as you think. My old drum brain (infamous Fame DD602) had a horrendous latency on its MIDI output. To clarify: I am comparing the MIDI setup with playing on a Roland TD-10 set, the Roland drum brain is not involved with Hydrogen. The MIDI data comes from an Alesis ControlPad which really is just a MIDI trigger, no drum brain involved. So I'd assume that since triggering MIDI events from hitting pads is the only purpose of the device, it does that without noticeable delay;-) But I can test that, connecting it as trigger to the Roland brain's MIDI input. If that shows clearly less latency, then I know something on the PC side is to blame. Heck... I can even connect the Alesis to the PC and route to a separate MIDI adapter into the Roland brain. If _that_ doesn't show the same latency, then Hydrogen is looking highly suspicious;-) And about JACK: I actaully got confused as I _think_ (talking of hunches here) that the latency improved while going from 3x64 to 3x256 or 2x512 periods ... or at least it didn't get _worse_. That, and the fact that you can rather nicely play guitar without noticing much of latency when using 3x256 or such on this laptop, suggests that JACK is not the source of the latency I feel there. But granted, the guitar play was with an USB audio interface ... the drumming was with the internal sound chip. But I'd be surprised if the USB interface had less latency than the internal chip. Alrighty then, Thomas. -- Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev ___ Hydrogen-devel mailing list Hydrogen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hydrogen-devel -- Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev ___ Hydrogen-devel mailing list Hydrogen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hydrogen-devel
