Re: Multichannel audio listening
On Wednesday, March 07, 2018 04:06:12 AM Rodolfo Medina wrote:
> Joel Roth <joelz@pobox.com> writes:
> > On Mon, Mar 05, 2018 at 10:39:19AM +0100, Rodolfo Medina wrote:
> >> After learning, some months ago, thanks to listers' help, how to live
> >> record into a multi channel audio file, I was wondering about the
> >> reverse problem: now I have my multi channel audio file, e.g. composed
> >> by three different channels. Is it possibile (I guess it is), and
> >> how?, to send each of the three outputs into a different loud speaker
> >> and so listen to the song...?
> >
> > Hi Rodolfo,
> >
> > Ecasound is pretty convenient for routing audio.
> >
> > If you connect three powered speakers to the first three
> > channels of a (sufficiently capable) soundcard and you're
> > using ALSA (the default low-level linux audio API), it's
> > pretty simple:
> >
> > For example,
> >
> > ecasound -i:3ch.wav -f:16,3,44100 -o:alsa,default
> >
> > If you need to fool around with the routing, you can do
> > almost anything. For example, assuming you have an
> > 8-channel soundcard and want to route ch1 to ch5, ch2 to ch6
> > and ch3 to ch7:
> >
> > ecasound -i:3ch.wav \
> > -f:16,8,44100 \
> > -chmove:1,5 \
> > -chmove:2,6 \
> > -chmove:3,7 \
> > -o:alsa,default
> >
> > Maybe you need to add separate effects (e.g. volume control) to each
> > channel:
> >
> > ecasound \
> > -a:in -i:3ch.wav -o:loop,3ch \
> > -a:ch1,ch2,ch3 -i:loop,3ch \
> > -a:ch1 -chmove:1,5 -ea:80 \
> > -a:ch2 -chmove:2,6 -ea:70 \
> > -a:ch3 -chmove:3,7 -ea:60 \
> > -a:ch1,ch2,ch3 -f:16,8,44100 -o:alsa,default
> >
> > There's a lot more you can do with ecasound, and there are
> > various front ends that provide a higher level of
> > abstraction.
>
> Fantastic... thanks, Joel. I want to buy one of those multichannel
> soundcards... Do you think this one could be all right...?
>
>
> https://www.strumentimusicali.net/product_info.php/products_id/51790/behrin
> ger-umc404hd.html?gclid=Cj0KCQiAuP7UBRDiARIsAFpxiRKgsptPW1qxkEw793ahs684ltl
> hyh5dcIgzLJXtDh39CZA8IEX3qgIaAnquEALw_wcB
Well, I'm not Joel, and I didn't read the description of that device
thoroughly (actually I google for it and then read a little bit about it in
English on Amazon), but I don't think that's what I had in mind when I
suggested something like 1 5.2 or 7.2 (or should that be 5.1 or 7.1)
soundcard.
The Amazon page I looked at:
https://www.amazon.com/s/?ie=UTF8&keywords=behringer+umc404hd&tag=googhydr-20&index=aps&hvadid=178390564539&hvpos=1t2&hvnetw=g&hvrand=939372652501756766&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9006968&hvtargid=kwd-113850346562&ref=pd_sl_18vyq1e9hy_e
Starting with the obvious, it's not a sound card (it is a separate standalone
device which can presumably be hooked to a computer, but I think the computer
would still require a sound card in addition to this device, because) it is
not clear to me that your computer can use this device to deliver 5 (or 7, or
4) separate "channels" of sound to it.
So, I wouild read carefully and hope for some more input from Joel.
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