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Welcome to my world... except I did it with Windows and a desktop PC.
Fetheads raise a "this signal is so low you have nothing that can pick it up" into a "this signal can now be picked up"... but actually your audio interface still needs to add gain, and I additionally use Reaper as a DAW to receive the signal from the audio interface and clean it and add even more gain.
Wait... you have turned on the phantom power on the goxlr right?
https://www.thomann.de/gb/tc_helicon_go_xlr_mini.htm Phantom power to +24v
That is what powers the fethead to be an amplifier for the mix. But yeah... I see it's a software switch in the goxlr.
I'd gone for this... more basic, but also everything is just within the audio interface https://www.thomann.de/gb/ssl_2.htm?ref=search_rslt_ssl%202_481700_0_0 as in, the 48v phantom power is a button and no app is needed.
Mine's also been an epic project... but I switched to Windows for my desktop as Linux failed with the Elgato Camlink very early in this experiment.
I since discovered that everything wants Windows. The entire streaming, Twitch, and audio and video production worlds must be Windows. Even things like the audio interface wanted Windows (though also claimed Mac support).
My project was smooth running as soon as I embraced Windows. FML.
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Velocio
@HatBeard
So who knew usb 3.0 controllers had a stupidly low limit on total resources.
Setting up a streaming/recording setup at the moment to pass the lockdown time by talking to myself in high-def and after spending a small fortune on kit, setting it all up just how I want, testing each item in isolation, buying endless cables and adapters to wire it all together and tidying said cabling I finally turn it all on at once to configure and none of it works properly or in some cases at all because i've apparently exceeded the usb resources on my machine.
seems my usb audio interface (goxlr mini) which I specifically bought as it creates multiple assignable soundcards in the OS so i can use it to control all kinds of levels uses a metric fuckton of usb IN/OUTS through its single cable. then throw in a webcam with in built mic and a video capture dongle with sound capture, a stream control keyed interface which a ton of oled key displays and an external HDD and to put it blunt I'm fucked. Even without all the things plugged in I was getting weird shit like my webcam would only do 720p and wouldn't focus itself giving the best beer goggles approximation i've seen in a long time.
Because the MBP only has two usb 3.0 ports and they share a controller, my setup of one port for the hdmi capture dongle and a powered usb 3.0 port for the rest has no way of splitting the load up to make it work and more usb hubs wont fix the bottleneck. A new machine is also not on the cards for a long while yet.
So my only solution (other than to set fire to all the kit and myself) seems to be a TB3 hub (CalDigit TS3plus) which will add two more controllers for usb 3.0 items so i can funnel the data for some of the devices through there instead. Only issue is any thunderbolt device is £££ (£200 in this case) and my MBP is TB2 so apple has me on the hook for £80 worth of adaptor and cable as well. ffs.
add on to the fact I already had to buy a fethead for my xlr mic which the internet definitely told me would have enough gain through my audio interface without one and I had to bootcamp my MBP to win10 just to get some of the software to work because mac support was shite. this has been a bit of a headache of a project.