Thank you for your quick fix! It is just fine now.
Good eye. I changed the title to reflect that there are no iOS crossover software(s) known at this time.The thread title includes iOS but nothing has come to light so far?
The only other easy to use solution I found is EKIO. It has very nice GUI; straightforward routing and filter options; although I guess it has no FIR filter options.
Thank you for the details of the tool. It's about 3:30 am and I'm off to snooze so I will add the details and link to the webpage when I get busy in the morning. Thanks again.@Doodski,
For MacOS, another free tool from Apple should do the trick: AU Lab. It's part of the XCode additional tools and lets you route audio from one interface to another and add Audio Unit Effects. An older version can be found here.
For me though, I cannot get it to work. I get no output at all. Maybe others have more luck...
It may also be interesting to note some of the DAWs that let you do live mixing and filtering of audio streams.