RME Fireface UFX+ and a RME M-32 Pro will give you 42 ins. expensive but sweet.
there are a lot of options in the RME line up and their drivers are tops. also, you could go Dante or AVB for lot’s of i/o in many configurations. see RME, MOTU etc.
there’s a lot of 8 i/o via analog + 2 x Adat i/o type interfaces out there. so, you can find used solutions for less $$$$ these days to get 24 i/o. just figure out your budget. look at what’s out there and whittle down your choices.
oh, almost forgot the 32 i/o 1u units from antelope audio. the Orion 32+ line of interfaces. all over USB2 or thunderbolt depending on which model. they’ve been a round a while so you could get na earlier version used somewhere.
DB25 is a physical jack, but not one you have or need.
So you’re looking for 24 1/4” jack inputs?
I think you’re gonna have a hard time finding that many 1/4” inputs without using DB25 cables unfortunately.
Can you use your focusrite as an ADAT input device like your Behringer? Then all you would need is an interface with 8 1/4” inputs that also has 2 sets of ADAT inputs (like the Presonus Quantum) to get to 24 inputs. I have an 18i20 gen 2 that I use as a slave ADAT device for my Quantum which gives me an addition 8 ins and outs.
I’ve got a Motu 828es which allows multiple adat. I’ve got that paired with an 8pre giving me 8 analog trs on the 828 +2x pres on the front and 8x on the 8pre. You could add on the ADA8200 to give you 26
I thought you only needed 24 inputs. 16 1/4” plus 2 adat pipes would give you 32.
I think all of the options have been added to this thread. You’re pretty much stuck having to switch connector types or use multiple boxes with ADAT unfortunately.
the fire face UFX+ and the other fire face series have aes/spdif and anything with AES can work w/spdif you just get a spdif to AES cable. you can get them in a few places. i use one w/my rme and dangerous Dbox.
Ferrofish make converters with 16 ins and outs to dual ADAT. All in a neat 1U rack.
You will still need to find an audio interface with two lots of ADAT ins and outs.
Are you using Mac or PC?
A Motu 896mk3 with Ferrofish Pulse 16 will give you everything you want I believe.