No signal from send to aux from assigned bus

Question

No signal from send to aux from assigned bus

Hi, I am fairly new to Logic Pro and am having trouble setting up an aux channel with reverb for a vocal headphone mix. I'm using the latest version of Logic with an SSL 18 audio interface with hardware monitoring (software monitoring off). I have an analogue input with a mic for vocals. I get signal on the input channel. The output is set to stereo out 1-2.

I create a send to an aux channel and set the send output. The aux channel is created and I set it to a bus I have names as Verb. I have a reverb plugin inserted. The output is set to stereo 1-2.

I know I will not hear the reverb with software monitoring off but I'm just looking for the mic signal. When I turn on software monitoring I get rhe mic signal and reverb to the aux channels. The problem is the aux channel is not receiving any signal from the Verb bus with software monitoring off (hardware monitoring thru the SSL 18) and I don't know why. It seems pretty straightforward to me: Input channel > bus > aux channel > output and I should see signal on the meter.

Will Logic aux channels and busses not work with software monitoring off? That seems absurd and can't be right. Is there a setting I'm not aware of to allow use of aux channels and busses with hardware monitoring?

What am I missing? Thanks for your help.

Mac Studio, macOS 26.0

Posted on Oct 30, 2025 7:38 AM

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Answer 1

Top-ranking reply

ckickenplucker Author

Level 1

7 points

Oct 30, 2025 8:44 AM in response to ckickenplucker

Ok I think the issue is all routing through busses is disabled with software monitoring off in Logic. (Please correct me if I'm wrong.) I can create an aux with the input set to the mic channel and hear the reverb.

The SSL hardware monitoring does not have a facility to insert effects so the solution is to create the second (aux) channel with the effect and return it to the 1-2 output to monitor with reverb.

I'm new to the SSL 18 also so I'm still figuring out how it all works. It's much different than my UAD Apollo which has DSP effects to monitor inputs with effects while recording.

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Answer 2

yoyoBen

Level 4

3,403 points

Oct 30, 2025 1:19 PM in response to ckickenplucker

ckickenplucker wrote:

The problem is the aux channel is not receiving any signal from the Verb bus with software monitoring off (hardware monitoring thru the SSL 18) and I don't know why.

Which aux channel are you referring to?
With Software Monitoring disabled, you are cutting the input signal flow from Logic going back to your monitor (speakers/headphones). Disabling Software Monitoring requires listening directly through your sound card. You won't get any reverb unless your sound card provides a reverb. This applies to the dry signal as well.
Unrelated to your question: When using Software Monitor (listening back through Logic), I recommend to lower the I/O Buffer Size and disable in Logic's top bar menu Record > Auto Input Monitoring. When having issues with Latency, try recording with Low Latency Mode activated, but always turn it off while playback.

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