Only mono inputs in Logic's (11.2.2) external instrument audio input pop-up

I am trying to integrate two external synths in Logic using the external instrument plugin. Their L and R outputs are connected to the interface's analog inputs 1, 2 and 3, 4. The MIDI part works, but the audio input pop-up list only shows the Fireface's mono channels. After 94 the list ends, no entries like 1-2 are visible. What must I do to make Logic use stereo inputs for the external instrument?

Mac Studio, macOS 15.6

Posted on Sep 4, 2025 4:32 AM

Similar questions

3 replies

CCTMusic

Level 2

307 points

Sep 4, 2025 5:50 AM in response to Martin Keller

It sounds like you have accidentally made a Mono External Instrument track?

To check, go to the Channel Strip in the Inspector and look at the Ext. Inst. plugin:

If it's set to Mono you will only see single channel inputs.

In the New Track dialog, you need to choose a stereo input as the source when making new tracks

CCT

[Edited by Moderator]

Sep 4, 2025 5:37 AM in response to CCTMusic

That's it. Thanks!

CCTMusic

Level 2

307 points

Sep 4, 2025 5:50 AM in response to Martin Keller

Great!

CCT

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Only mono inputs in Logic's (11.2.2) external instrument audio input pop-up