Have you remembered to start as pd -audioindev 1,2,3,4 ?
On Tue, 18 Dec 2007 12:22:40 +0100 "tania habib" <[EMAIL PROTECTED]> wrote: > 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 -- Use the source _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
