Hi Derek, I am working on Mac Pro osx 10.4, I have not tried the two different soundcards option, we use the multichannel sound card for our recordings. But we wanted to try the recording with iMic's, do you know a link or a way to link two or multiple iMics together?
Thanks for the link, it looks interesting, I will check it out in detail but this is not the direction we want to proceed at the moment. tania On Dec 18, 2007 12:06 PM, Derek Holzer <[EMAIL PROTECTED]> wrote: > Hi Tania, > > are you able to record from two different soundcards simultaneously in > any other application on your computer? I ask because this isn't usually > the case in my experience. Many have dreamed of linking several "el > cheapo" soundcards to get an inexpensive multichannel soundcard from > them. Two (or more) different soundcards have two different sample > clocks and these won't be in sync, among the main problems. Google "el > cheapo soundcard", or check here: > > http://quicktoots.linuxaudio.org/toots/el-cheapo/ > > To see how this might be accomplished on Linux. There, it requires the > hardware modification of removing the clock from one card and connecting > it to the clock of one master card. > > And I quote: > > > The challenge in recording with more than one soundcard at once in any > > computer under any operating system is to make the cards syncronize. The > > actual sample rate of each card is depending on the crystal used in the > > card. To cut the component cost of consumer grade soundcards cheap > > crystals, with wider tolerances than those used in pro equipment, are often > > used. As a result, when using two cards at once one can have a real sample > > rate of 44.099 kHz in one card and a samplerate of 44.101 kHz in the other. > > This is no problem when recording with one card only, but the difference in > > the sample rates will cause phase shifts in the recording when using two > > cards. Phase shifts make the high frequencies of the recording e.g. cymbals > > sound bad. Further, not all audio drivers can drive cards that are not in > > exact samplerate sync. > > > > Some pro-cards come equipped with a link to connect multiple cards to run > > in sync. Consumer cards do not have this feature. This Howto describes a > > simple hardware modification to create such a synchronisation link between > > consumer grade cards. Without hardware modifications it is very difficult > > to ensure the cards are in sync. > > > You haven't mentioned the operating system you are running, BTW... > > Maybe other operating systems allow multiple (consumer) soundcard > recording, I haven't tried. In PD, I don't think it's possible. If you > had a way of getting your two IMics to be seen as one soundcard (the > Linux el cheapo method), then you could try it. > > best, > d. > > > tania habib wrote: > > Hi List, > > I have a question regarding a patch that I made for recording > > multi-channel audio. > > For the 16 channels, we are using Fireface 800 with an extension > > board. It works quite well! > > For a specific application, we are trying to use the two iMic's with a > > USB plug to record at least 4 channel audio. > > When I initialize PD and select the audio settings, it shows me two of > > these seperately in the option, the recording for one works but not > > for the other! > > The question is if I can use PD to record simultaneously from two > > different source from a single patch or somehow get the recording from > > both! > > regards, > > Tania > > > > _______________________________________________ > > [email protected] mailing list > > UNSUBSCRIBE and account-management -> > > http://lists.puredata.info/listinfo/pd-list > > > > -- > derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/macumbista > ---Oblique Strategy # 94: > "Is it finished?" > _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
