Virtual Audio Routing, Mac Aggregate Devices Setup
A host describes a three-week technical process to configure a "mix-minus" signal on a Mac for podcast production. The setup utilizes Mac's aggregate devices feature to stack multiple input and output devices into a single interface for Ableton Live. A specific routing error involving Skype's mono signal caused a feedback loop until it was identified that the software was being treated as a stereo source.
macintosh· skype· ableton live· virtual audio routing· aggregate devices
00:01 Hello, everybody once again it is time for the program that has no commercials. No jingles no music well Certainly no agenda coming to you from the curry manor in the United Kingdom I'm Adam Curry and I'm out here in sunny California. I'm John C Dvorak John good afternoon Let me launch right into it. I finally fixed it so that you can hear audio when I play it back Yeah, they know do you know how long how long I worked on this oh? You apparently worked on it all day yesterday or otherwise we would have done the show. Yeah, not just yes I've been thinking about this for It's been like at least three weeks and what I couldn't figure out was well you know what? I wanted to do is I want to be able to send you a mix minus signal And so I couldn't send my voice fine and I could send
00:52 Music over but if I wanted to send something for my handy little cart rack It was it was driving me nuts because you know, you do this on the Mac. I don't have you ever done this You can do virtual audio routing Have you ever heard of this? You're doing this on the Mac. Yeah, you can do um... Well this isn't going to do me any good! Yes it will because you're gonna get a laptop eventually and new one that'll be a mac you know it will no it won't cuz I my end I'll say this again as much as I think the max is great machine I like using laptops that are two pounds
01:27 Absolutely the smallest, the lightest you can get with a full-size screen and big keyboard. And that's the Toshiba and that's the R series. Now the new one, the R500 is like 2.2 pounds total and it has got a DVD player in it! Yeah but what are you trying to say? When I travel with a laptop...I'm not going to go to a Mac they're too big and heavy. Okay so honestly how often do you do Tech 5 on the road versus at home I'd rarely do it. I've done it a couple of times, but I prefer to do evergreen shows instead. Right okay so my point exactly So makes a lot of sense To set you up for once and for all with the fans. This is the beauty I have been searching for
02:16 For it's uh, it's been five years now has a bit funny at 2000 2004 when I started doing this stuff. I've been looking for the all-in-one solution where you can do everything right on one computer and the Mac finally is there you have this thing called aggregate devices where you can stack on multiple in and output devices, virtual or real. You can stack them into one because most programs can only talk to one device at a time so now I can finally do all of that complex routing that is really needed to put together a kick-ass studio And anyway, to make a long story short what was screwing me up is I was trying to route the audio from Skype into the virtual mixer through one of these virtual interfaces. And whenever I did it you know because you have one coming in and going back and the output signal of course is all this stuff that I want you to be able to hear
03:10 And every single time I made the connection, it would create a loop and then it would just feed back. And I couldn't figure out until I finally discovered of course after weeks trying to figure this out that I was treating Skype as if it had a stereo signal coming out so I was using two channels whereas it only has one So effectively by placing two connections between Skype and my mixer I was creating a loop just by making those two connections Does that make any sense? Yeah, it does to me but let's back up a couple seconds. One... You know one you probably could have asked for help from the audience And you would have gotten it like the next day so that's wasting three or four weeks working this out. No no no I Have been on this quest and the audience has been involved a guy who's come to close ever bring us up on your other show hold On one more time, I don't believe for a second that there's not a PC user out there That listens to this show or whatever other shows that can't do the same thing on a PC more effectively
04:12 Wow, throwing down the gauntlet man. I love it! You know what actually? I'll bet you're right. I don't know if it can be done more effectively but I do know that Ableton Live which is the program I'm using also runs on Windows so I guess if someone could figure out how to do virtual audio routing then they could make it happen and of course you need it and then we'll set up a nice Windows version for you How does that sound? Been drinking beer again in the evening I apologize. There's a story going around we had, I don't know if you blogged it or not but something that was thinking actually my stepson sent it to me there is this farting thing going on in some American schools where the boys are into noisy public flatulence as a gag and they just do it constantly I guess in class and its becoming something of a problem Oh really?
