[GoodOlJoeParticipant]

I’m a Windows guy and I don’t know MacOS or Reaper well enough to respond precisely, but a couple of things:

1. In Reaper you will need to have the Audio Device set to the CQ (in your screenshot it is set to a Scarlett audio interface)

2. The Master track in Reaper needs to be sending its output to the USB channels which the CQ routes to the “USB” input channel on the CQ. (Again, on the CQ12 that’s USB channels 13 & 14. On a CQ20 it may be 21 & 22, I don’t know for sure.) Precisely how to set the Reaper Master to output to those channels on MacOS I also don’t know. On Reaper for Windows I would set the output channels min to 13 and max to 14, which would force the Reaper Master bus to use output channels 13 and 14 as the hardware output. Very different on MacOS I’m sure but the point is: 1) find out which USB channels on the CQ20 are hardwired to the ‘USB’ input channel, then 2) do whatever is required for Reaper Master to send audio out those two channels.

[GoodOlJoeParticipant]

The schematic and info I posted on another thread may be helpful to you

Thread here

[GoodOlJoeParticipant]

@TheAngryPenguin

I don’t know your specific scenario, but in my scenario I don’t flip input sources back and forth. I’m using the CQ12T as an input mixer to my DAW running on the computer. I keep the CQ12T in stream mode “Multitrack”. All the channels with physical input jacks are set to Analog inputs and stay that way. Whatever signal comes in via those analog inputs gets sent out to the DAW on the same-numbered USB channel. So if I’m tracking guitar, I set the input channel on the DAW track I’m recording to the channel my guitar is plugged into. Keyboard tracks get input from the keyboard channels, and so on.

For playback from the DAW, I’m mixing in the DAW, not on the CQ12T. The only output back to the CQ12T is a stereo pair containing the output of the DAW’s master bus (the whole stereo mix). The master bus in my DAW mixer sends audio out via the two USB channels that go to the CQ12T’s input channeled labeled “USB”. Those channels are 13 & 14 for the CQ12T, they’re different for the CQ20, maybe 21 & 22 but not sure. The CQ12T input channel labeled “USB” has no analog input jack, it’s dedicated to audio coming in on just those two specific USB input channels.

As for overdubbing, you said Reaper so I assume you’re talking about recording to Reaper not to an SD card in the CQ12T. So overdubbing is just like any other kind of recording, you hit arm the track you want to record, the rest are playing back. The master bus is sending the mixed playback out to the CQ12 over USB channels 13 & 14, to the “USB” input channel on the CQ12T so you can hear them. All other CQ12T channels are set to Analog input and so what you’re playing into the record track is coming from CQ12T over USB. You can monitor the live instrument from the CQ12T (before it goes to the DAW) or out of the DAW, whatever meets your need. Whichever platform you’re monitoring from, you’ll want to turn off monitoring on the other one of course.

Sorry if I’m missing the point of the challenge you’re having, hope that helps though.

[GoodOlJoeParticipant]

I own a CQ12T and created a (simplified) schematic of the USB routing to and from a USB-connected computer. The schematic depicts Multitrack mode only. Now that I understand it, the routing is straightforward but it was a little hard to get my head around initially for several reasons. If you’re reading this thread because you can’t figure out the USB routing, don’t feel bad. The mixer UI is generally intuitive, you’re not alone if you find the “Channel Assignment” part of the UI very un-intuitive.

1. It contains insufficient information to tell you what you’re really mapping, or even which direction (input or output). It’s obvious once you understand it, but to a new user coming from other mixers, it’s not obvious at all. Even the tab label under Configs is not helpful: Other tabs are labeled Config, Inputs and Config, Outputs which set the context for the whole tab. But Channel Assignment settings are on a tab labeled Config, USB/SD and the words input or output don’t appear anywhere so there are no clues to what direction you’re mapping. A redesign of the visual labeling and layout of Channel Assignment would help a lot.
2. There’s incorrect labeling in the CQ Mixpad app which labels the output USB channel pairs as 17/18, 19/20, and 21/22 when, on a CQ12T, they are really 11/12, 13/14, and 15/16.
3. In Windows 10, the output devices exposed by the ASIO driver (output from Windows perspective) are labeled CQ 1&2 (ST IN), CQ 5&6 (USB) and CQ 7&8 (BT), but those actually correspond to USB channel pairs 11/12, 13/14, 15/16.
4. It’s also confusing because six of the assignable items are CQ outputs (Main LR, Out1/2, etc.) but one is a CQ input (ST IN). It makes you think you might be mapping PC-channels-to-CQ-Inputs.

Regardless of these issues, it’s a great mixer, and the USB interface is easy to use once you get your head around it.

Perhaps this schematic will be helpful to others (and I sure hope it’s correct!)

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