[Csnd] pseudo 5.1 and ortoperspekta csd

Date	2013-07-24 20:41
From	Matti Koskinen
Subject	[Csnd] pseudo 5.1 and ortoperspekta csd
	hi, I got my pseudo 5.1 and ortoperspekta csd reading soundflower and outputting to my cheap 6-ch usb audio (OSX)., with cs6. Somehow my mac sometimes find this card as 6-ch, sometimes only 2-ch. I noticed, that if the card was on usb-hub, it was always 2-ch, plugging directly to mac, it usually was 6-ch. But now I've plugged and unplugged, and it's always 2-ch. Any ideas why? I've restarted mac, and nothing. here's the csd. The 5.1 part was found on some paper, ortoperspekta (as the inventor Tapio Köykkä wanted it to be called) gives very good audio spatialisation on orchestral and solo piano, while rock (progressive) sounds better with pseudo 5.1. For ortoperspkta, I earlier used a very simple passive circuit, 4 resistors and a line transformer from am old modem card, worked surprisingly well. The sum is driven to one channel and the difference from the transformer to another channel and the front speakers connected in series out of phase. the csd <CsoundSynthesizer> <CsOptions> -b 30 </CsOptions> <CsInstruments> sr=48000 kr=4800 ksmps=10 nchnls=6 0dbfs=1 instr 1 ; simulate 5.1 from stereo irr = 1 ; rear right irl = 2 ; rear left ic = 3 ; center ilfe = 4 ; LFE il = 5 ; left ir = 6; right ; input al,ar inch 1,2 asum = (al+ar)0.707 asurr = (al-ar)0.707 ac butterlp asum,4000 acenter balance ac,asum ab butterlp asum,200 alfe balance ab,asum adl delay asurr,0.012 adl1 butterlp adl,7000 adly balance adl1,adl arl,arr hilbert adly outch irr,arr1.6,irl,arl1.6,ic,acenter,ilfe,alfe1.1,il,al,ir,ar endin instr 2 ; ortoperspekta irr = 1 ; rear right irl = 2 ; rear left ic = 3 ; center ilfe = 4 ; LFE il = 5 ; left ir = 6; right ; input al,ar inch 1,2 asum = (al+ar)0.707 adiffl = al-ar adiffr = ar-al ab butterlp asum,200 alfe balance ab,asum ac butterhp asum,150 acenter balance ac,asum outch ic,acenter,ilfe,alfe*1.1,il,adiffl,ir,adiffr endin </CsInstruments> <CsScore> i1 0 3600 i1 3600 3600 e </CsScore> </CsoundSynthesizer> -matti "Grep less", sed tee uniq tail cat

Date	2013-07-24 23:17
From	Justin Smith
Subject	Re: [Csnd] pseudo 5.1 and ortoperspekta csd
	Regarding why it would be 2 channel on a hub but 6 channel otherwise, there may not be enough bandwidth going through the hub for 6 channels to work. Also it will only have enough bandwidth if in a usb2 or usb3 hub. You could ensure that you are plugging the card into a USB 2 or greater port, that the port supplies enough power for the device to run all the channels, and that the device does not have a "usb1.1 mode" override that has been activated (my sound devices usbpre2 has this for example). On Wed, Jul 24, 2013 at 12:41 PM, Matti Koskinen <mjkoskin@kolumbus.fi> wrote: hi, I got my pseudo 5.1 and ortoperspekta csd reading soundflower and outputting to my cheap 6-ch usb audio (OSX)., with cs6. Somehow my mac sometimes find this card as 6-ch, sometimes only 2-ch. I noticed, that if the card was on usb-hub, it was always 2-ch, plugging directly to mac, it usually was 6-ch. But now I've plugged and unplugged, and it's always 2-ch. Any ideas why? I've restarted mac, and nothing. here's the csd. The 5.1 part was found on some paper, ortoperspekta (as the inventor Tapio Köykkä wanted it to be called) gives very good audio spatialisation on orchestral and solo piano, while rock (progressive) sounds better with pseudo 5.1. For ortoperspkta, I earlier used a very simple passive circuit, 4 resistors and a line transformer from am old modem card, worked surprisingly well. The sum is driven to one channel and the difference from the transformer to another channel and the front speakers connected in series out of phase. the csd <CsoundSynthesizer> <CsOptions> -b 30 </CsOptions> <CsInstruments> sr=48000 kr=4800 ksmps=10 nchnls=6 0dbfs=1 instr 1 ; simulate 5.1 from stereo irr = 1 ; rear right irl = 2 ; rear left ic = 3 ; center ilfe = 4 ; LFE il = 5 ; left ir = 6; right ; input al,ar inch 1,2 asum = (al+ar)0.707 asurr = (al-ar)0.707 ac butterlp asum,4000 acenter balance ac,asum ab butterlp asum,200 alfe balance ab,asum adl delay asurr,0.012 adl1 butterlp adl,7000 adly balance adl1,adl arl,arr hilbert adly outch irr,arr1.6,irl,arl1.6,ic,acenter,ilfe,alfe1.1,il,al,ir,ar endin instr 2 ; ortoperspekta irr = 1 ; rear right irl = 2 ; rear left ic = 3 ; center ilfe = 4 ; LFE il = 5 ; left ir = 6; right ; input al,ar inch 1,2 asum = (al+ar)0.707 adiffl = al-ar adiffr = ar-al ab butterlp asum,200 alfe balance ab,asum ac butterhp asum,150 acenter balance ac,asum outch ic,acenter,ilfe,alfe*1.1,il,adiffl,ir,adiffr endin </CsInstruments> <CsScore> i1 0 3600 i1 3600 3600 e </CsScore> </CsoundSynthesizer> -matti "Grep less", sed tee uniq tail cat

Date	2013-07-24 23:22
From	zappfinger
Subject	[Csnd] Re: pseudo 5.1 and ortoperspekta csd
	It is always recommended to connect USB audio directly to a Mac USB input, preferably number 1, and not via a USB hub. Richard -- View this message in context: http://csound.1045644.n5.nabble.com/pseudo-5-1-and-ortoperspekta-csd-tp5726005p5726008.html Sent from the Csound - General mailing list archive at Nabble.com.

Date	2013-07-25 02:57
From	Matti Koskinen
Subject	Re: [Csnd] Re: pseudo 5.1 and ortoperspekta csd
	On Jul 25, 2013, at 1:22 AM, zappfinger wrote: > It is always recommended to connect USB audio directly to a Mac USB input, > preferably number 1, and not via a USB hub. > > Richard > > thanks to all. Yes, I figured the bandwidth is why it's 2-ch on hub, but now I can't get it 6-ch, no matter what port on Mac I use. The card isn't officially supported on osx, but used to work just fine. But 3 usb-cards on a hub connected as aggregate device, seem to work fine! Running thru csound sounds much better than using the card on Win7, where it is 6-ch, and M$ pseudo 5.1. Never even knew this, but win7 iTunes plays my collection on Mac just fine. But using csound gives much more control, I can add reverbs and adjust the volumes independently of each channel, and do all kind of tweaks. And aggregate device works ok. -matti