Go to Sweetwaters site and look at the mixers. ( or any on line retailer)  Most of the popular models are listed and compare features when you look at the bottom. 
You can even ask the Sweetwater people what your looking for. Asking on general forums is going to result in conflicting information as many people will have many different opinions and ideas. 
 
Study the specifications of the mixers and make a list of what you want. 
 
Sounds like you'll be comparing multi channel USB capable models. 
https://www.sweetwater.com/c264--Analog_Mixers
 
FYI,, none will be USB 3. All are USB 2 which can easily hadle 24 channels of audio. 
I record 16 tracks using my Tascam us164 and a 2008 Sony laptop recording audio is not very demanding. It's what you do with it afterwards. 

gswitz
The UFX+ has MADI for 94/94 channels.
 
You have to plug in other MADI compatible units, but it gives you a single input for up to 94 channels to the computer (USB3 or firebolt - I mean thunderbolt).
 
Me, I don't want the trouble to set up that many mics. Who does?
 
Someone would have to pay me.
 
:-)
 
You can hook up external compliant mixers to the RME units. Idk about the tascam 20x20.
 
That said, while RME UCX supports a mixer, I haven't met or hear of anyone using an external mixer. The closest is people who get good with the RME Remote Controls. For the most part, we all do it in the computer or on the iPad.
 
RME's iPad solution doesn't wander. You are tethered and not wireless. I don't know of any effort to enable untethered wireless wandering from RME units. When I say tethered, I mean you have an actual USB cord connecting the iPad to the UFX/UCX.

No idea what you are saying but i'll figure it out :)
 
Thanks!

Cactus Music
Go to Sweetwaters site and look at the mixers. ( or any on line retailer)  Most of the popular models are listed and compare features when you look at the bottom. 
You can even ask the Sweetwater people what your looking for. Asking on general forums is going to result in conflicting information as many people will have many different opinions and ideas. 
 
Study the specifications of the mixers and make a list of what you want. 
 
Sounds like you'll be comparing multi channel USB capable models. 

 
FYI,, none will be USB 3. All are USB 2 which can easily hadle 24 channels of audio. 
I record 16 tracks using my Tascam us164 and a 2008 Sony laptop recording audio is not very demanding. It's what you do with it afterwards. 

Good advice. Thank you.

RME UFX and UCX can be controlled using mackie interface plugged in through midi ports.

https://www.rme-audio.de/download/fface_ufx_e.pdf

See page 88.

This gives you physical faders and pan pots etc for your interface. I don't have any friends controlling an RME this way.

There is another way to put in a hardware controller for the interface...
https://www.sweetwater.com/store/detail/ARCUSB

This device is made by RME for RME users.

...

Another tool for controlling the interface is an iPad.

...

The most common controller is a computer. Using a touch screen you can adjust settings silently.

The four methods above all require a device physically wired to the interface. That means you cannot take it with you into the crowd.

I have a feeling you don't understand my question? Also i'm not buying a 2000 dollar UFX haha. But thanks for your time though.

The Tascam US 20x20 is a good candidate, I would think.  8 pres, 10 ADDA converters, while the other 10 of 20 ins/outs come from the optical (ADAT) and Spdif in/out.  So $500 for 20 input/output channels, tho you need to find an ADAT unit or mixer output to get to 20.  All good quality hardware and USB 3 (which gets me down to 4-5 ms latency here at home).
 
Other than having to add an ADAT ADDA it should be pretty simple to physically route the appropriate mixer (needs line outs for each channel or plenty of buss and subs) to the inputs.  But then you have to set up the TASCAMs soft mixer for internal routing.  Then set up SONAR's soft mixer.  So, it can get a little complicated which means you just have to be careful.  But it can be done

Also a slightly related question. IF i ever get a mixer connected to my computer, what happens with the Sonar mixer? Let's say on my analog mixer i push the fader up, what happens to Sonar's fader on that same channel? Does it move along? If not what do i do with Sonar's mixer? Just ignore it?

Unless it is a controller mixer, the mixer simply controls its own internal sounds.  SONAR (and your interface with a its own soft mixer) don't change at all.
 
You can't ignore SONAR's mixer - it controls how much of the signal from your mixer gets into SONAR.  And you still mix out of it, using automation.  That is how it is usually done.  In that case, the mixer is static and the levels should be zeroed out.

Somanyquestions
Also a slightly related question. IF i ever get a mixer connected to my computer, what happens with the Sonar mixer? Let's say on my analog mixer i push the fader up, what happens to Sonar's fader on that same channel? Does it move along? If not what do i do with Sonar's mixer? Just ignore it?

 
Nothing will happen if it's an analog mixer. The USB connection from analog mixers only sends audio back and forth. 
Some digital mixers can control Sonar but you need to set that up and it's obviously not easy when you read all the posts about this topic. Example my Yamaha 01V will control SOnar via it's midi port but I have to configure a long list of menu options first. 
A control surface is not a mixer as it has no audio only the controls. 

AT
Unless it is a controller mixer, the mixer simply controls its own internal sounds.  SONAR (and your interface with a its own soft mixer) don't change at all.
 
You can't ignore SONAR's mixer - it controls how much of the signal from your mixer gets into SONAR.  And you still mix out of it, using automation.  That is how it is usually done.  In that case, the mixer is static and the levels should be zeroed out.

Confusing. Unless i'm reading it wrong you are saying you use the Sonar mixer and then you say it's static at 0 level?