Thanks, that made me smile.
Yes, it’s a home-built mini tower that has an on-motherboard sound card that I’m not using (and that I have disabled in BIOS). Externally I have a Rocksmith USB guitar cable, which I’m not using for this activity, and the UMC404HD connected over USB.
I am not using any microphones. I am using the UMC404HD to be able to record four channels simultaneously.
SQ is a matrix encoding format used mainly for four channel (Quadraphonic) recordings on LP vinyl discs. It was relatively popular in the first half of the 1970s. Its phase encoding of rear channel sum and difference information allows it to present a two channel playback from the disc that is pretty similar to the stereo mix, so that SQ records can play on non-SQ systems.
To decode the other two channels, an SQ decoder is used. Mine is an external box - a Lafayette SQ-W.
The preamp is the Marantz AV7005. It supports 7.1 audio with HDMI video switching. When fed through digital inputs, its onboard DACs can handle up to 24/192 signals, and it provides delay, level control, bass management, and some amount of room correction EQ. It also has one set of 7.1 analog inputs, but these do not provide any signal processing other than volume control - they are just fed fairly directly to the outputs.
So, my setup is that the PC is connected to the preamp by HDMI. The preamp is connected to the TV by HDMI, which provides my main PC “monitor” when the preamp is set to the PC input. For the recording signal here, I have a turntable connected to the preamp, with the tape loop sending the analog stereo signal to the SQ-W decoder. The four-channel analog output from the decoder goes to the four inputs (at line level) of the UMC404HD. The PC then gets the USB output from the UMC.
Challenges I have with this:
To record from an LP, I need to switch the preamp to Phono. At that point, HDMI video from the PC is no-longer being routed to the TV. Currently I have a separate 22" monitor connected to the PC so I can run Audacity on that when I can’t view the main monitor/TV. I’d rather duplicate the desktop directly to the TV over DMI, but the nVidia card doesn’t seem to support that.
In some cases I want to record other four channel inputs, like from a Quad 8-track deck. This would be fed directly into the UMC404HD, so, to monitor it, I would want to be able to feed the signal (at least a stereo mix-down of it) back to the preamp from Audacity (over HDMI).
(Probably related to 2) At some point, Windows Update replaced the Behringer UMC404HD driver with Microsoft’s own. Their’s doesn’t support higher sample rates and was locked to 44.1. I installed the newest Behringer driver manually, but that now provides 2X2 inputs for WASAPI instead of 1X4. I then went back to their older (3.29) driver, and got the 1X4 input back, but, for some reason, it will not save a change to sampling rate in Control Panel. Whatever I select, even if it’s just after a reboot, Windows complains that the device is in use, and then does not seem to save the setting… leaving me stuck with 24/44.1.
I am currently working on building Audacity with ASIO support, to see if that fixes my sample rate problem, and hopefully corrects at least #3, and maybe #2 as well.