How to create an external mono insert?

Hi,
i have problems to create an external analog mono EQ (API 550a) to a mono track as insert in cubase.
Stereo inserts work fine, but mono external efx aparently not.
Am I missing something here?
Thanks for helping.

Hi,

Could you be more specific, please?

It was a routing mistake - patchbay madness…
:wink: