logic pro I/O plugin is routing direct signal to Aux/Bus

Question

logic pro I/O plugin is routing direct signal to Aux/Bus

I have an external T.C electronic M1 effects unit hooked to my RME interface via SPDIF that comes in on channels 9-10 using the Logic I/O plugin. The issues is, I can not get 100 percent wet signal only to an Aux/bus. I'm reading that this is a known issue with the I/O plugin. I have no issues routing the wet only signal to an audio track to record just the effect, but if I want to monitor just the effect in real time, this does not seem possible which seems crazy because that's how traditional mixers work.

I use a simple 88 key piano USB controller.

My source input track in Logic is a piano instrument, with it's send set to pre-fader.
The send routes to Aux/bus 1, which contains the I/O plugin that brings the external reverb into Aux/bus 1. If I turn the source track all the way down or it's output off, I should only be hearing 100% wet effect in Aux1 as my external reverb engine is set to 100% wet output. This is not the case, I'm still hearing direct signal.

Again, this seems to be a known issues with the I/O plugin. Also the Direct/Wet slider in the I/O plugin only cuts the wet signal if you move it to the left (0), but setting it to the right 100% still introduces direct signal. You should be able to monitor just the wet signal on a Aux/bus without direct signal. And you can with the built in software plugins, but not external effects.

Thankfully I can route Aux 1 output to Aux2 and then assign bus2 as an input to an audio track to record just the effect, but not being able to monitor an external effect in real time or playback seems unusual for a DAW

Mac mini

Posted on Aug 21, 2025 02:29 PM

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Answer 1

Top-ranking reply

Logiciswhyicame Author

Level 1

25 points

Aug 22, 2025 07:44 AM in response to Logiciswhyicame

It turns out, It was a misunderstanding on my part with routing in my

Total Mix monitor routing software for my RME. In Total Mix, I had

the software monitoring SPDIF fader turned up which was causing the

dry signal in the AUX1 (the signal being sent out the I/O plugin) to

route out to my main outputs and phones.

In other words, my SPDIF fader was turned up in my interfaces

routing software so I was hearing the direct signal in the effects

AUX before it was sent out to be processed, and I was also hearing

the wet signal on the same AUX that the same signal comes in.

Just turning it down in total mix fixed the issue by letting me solo

the AUX1 - so now I'm able to hear just the wet signal on the AUX1.

The Logic I/O plugin is working fine.

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Answer 2

Aug 21, 2025 02:56 PM in response to Logiciswhyicame

In the second paragraph, where I said, "I'm still hearing direct signal" I mean to say, "I'm still hearing direct signal mixed in with the wet signal."

The point is that I'm trying to just hear and monitor only wet signal. I should not be hearing any direct signal in the Aux with the source track's fader down and it's send set to pre-fader.

You should be able to monitor just the wet signal on a Aux/bus without direct signal. And you can with the built in software plugins, but not external effects.

I've even tried routing to outputs 9-10 direct instead of the I/O

plugin, but I still get direct signal.

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Answer 3

Johne154

Level 2

303 points

Aug 26, 2025 03:22 PM in response to Logiciswhyicame

Thanks for posting your solution!

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