Hi list,
I've got 11.6ms latency on a Lexicon Omega, with Pure Dyne and Jack. Audio input through a pitch shifter then output. It's good enough to play expressively, and for only £125.
I recommend it. Ed
Metastudio 4 for Pure Data - coming soon! Metastudio 3 still available at http://sharktracks.co.uk/puredata
This is good to know.
Me, I've got an M-audio Fast Track Ultra (6 ch in and out, USB2) for $350 I think. There's a problem with occasional samples getting dropped in linux (works fine on Mac) which I'm hoping the ALSA folks will eventually fix, but meantime I made a special Pd mod to drop an equal number of samples on input and it's sort of working. I'd advise holding of on buying this one until the driver gets fixed.
cheers Miller
On Wed, Jan 26, 2011 at 12:22:06AM +0000, Ed Kelly wrote:
Hi list,
I've got 11.6ms latency on a Lexicon Omega, with Pure Dyne and Jack. Audio input through a pitch shifter then output. It's good enough to play expressively, and for only £125.
I recommend it. Ed
Metastudio 4 for Pure Data - coming soon! Metastudio 3 still available at http://sharktracks.co.uk/puredata
Pd-ot mailing list Pd-ot@iem.at http://lists.puredata.info/listinfo/pd-ot
But do any of you guys get 24 bits and at least 48kHz samplerate? Isn't there some limitations from only having standard usb class compliancy? (didn't check if any of those devices have specific drivers)
I'm looking to buy the M-Audio Fast Track Pro, but not getting full performance could sometimes be a bummer.
I haven't looked into how to check these things. From M-Audios homepage they say you only get 16 bits from standard usb compliancy.
"Class compliancy supports 16-bit/48kHz 2 x 4 operation on OS X 10.3.9 and higher. Driver installation required to access more I/O." http://www.m-audio.com/products/en_us/FastTrackPro.html
On 01/29/2011 12:26 AM, Miller Puckette wrote:
This is good to know.
Me, I've got an M-audio Fast Track Ultra (6 ch in and out, USB2) for $350 I think. There's a problem with occasional samples getting dropped in linux (works fine on Mac) which I'm hoping the ALSA folks will eventually fix, but meantime I made a special Pd mod to drop an equal number of samples on input and it's sort of working. I'd advise holding of on buying this one until the driver gets fixed.
cheers Miller
On Wed, Jan 26, 2011 at 12:22:06AM +0000, Ed Kelly wrote:
Hi list,
I've got 11.6ms latency on a Lexicon Omega, with Pure Dyne and Jack. Audio input through a pitch shifter then output. It's good enough to play expressively, and for only £125.
I recommend it. Ed
But do any of you guys get 24 bits and at least 48kHz samplerate? Isn't there some limitations from only having standard usb class compliancy? (didn't check if any of those devices have specific drivers)
Hmmm, good question. Jack is telling me I have 24 bits capture and playback at 44.1KHz. Haven't tried it at 48 yet, but I'll do some tests once this gig on monday is over.
I'm not using any specific driver for the Lexicon - Jack is using alsa so snd-usb-audio is the driver I think. The main thing I think is that it seems much more stable than when I was using an edirol FA101 with freebob. That's probably also because I'm using Pure Dyne - Ubuntu 9.10 optimized for audio with the realtime kernel. I won't use anything else now.
I made the mistake of buying a comp without firewire, but this seems to have been a good mistake now!
Best, Ed
On 01/29/2011 12:26 AM, Miller Puckette wrote:
This is good to know.
Me, I've got an M-audio Fast Track Ultra (6 ch in and out, USB2) for $350 I think. There's a problem with occasional samples getting dropped in linux (works fine on Mac) which I'm hoping the ALSA folks will eventually fix, but meantime I made a special Pd mod to drop an equal number of samples on input and it's sort of working. I'd advise holding of on buying this one until the driver gets fixed.
cheers Miller
On Wed, Jan 26, 2011 at 12:22:06AM +0000, Ed Kelly wrote:
Hi list,
I've got 11.6ms latency on a Lexicon Omega, with Pure Dyne and Jack. Audio input
through a pitch shifter then output. It's good enough to play expressively, and
for only £125.
I recommend it. Ed
Normally I would recommend firewire before usb because of the support issue, but for firewire you'll need a good combination of hardware to support it. -The right firewire chip on your computer (not all chips work well) -no troubling irq sharing issues (can be mended using a -rt kernel and rtirq script) -On top of that it seems like some apps, like Network-manager can affect firewire performance, making it periodically cause xruns on jackd.
At least you get full support on a lot of devices. And if you do have a good computer to go with it, you get multichannel support. Even daisy-chaining works if you need more than 8 channels (new firewire-stack has had an issue not supporting daisy-chaining, but this aught to be, or has already been corrected).
Playing 16 bit wave files using 24 bit card setting isn't as audible as playing a 44.1 kHz file with the wrong samplerate. Just an example. Don't know how these things work on alsa when it comes to 24 bit setting, and if it truly sets that. I suppose if you run jackd and it says 24 bit operation then that aught to mean 24 bit operation. I know there is a limitation on how much info you can pass using usb 1.1 class compliancy. So that restricts number of channels, bits and samplerate. How exactly that works, I have no idea.
n 01/29/2011 01:44 AM, Ed Kelly wrote:
But do any of you guys get 24 bits and at least 48kHz samplerate? Isn't there some limitations from only having standard usb class compliancy? (didn't check if any of those devices have specific drivers)
Hmmm, good question. Jack is telling me I have 24 bits capture and playback at 44.1KHz. Haven't tried it at 48 yet, but I'll do some tests once this gig on monday is over.
I'm not using any specific driver for the Lexicon - Jack is using alsa so snd-usb-audio is the driver I think. The main thing I think is that it seems much more stable than when I was using an edirol FA101 with freebob. That's probably also because I'm using Pure Dyne - Ubuntu 9.10 optimized for audio with the realtime kernel. I won't use anything else now.
I made the mistake of buying a comp without firewire, but this seems to have been a good mistake now!
Best, Ed