I searched the forum, and it looks like the last time this was discussed was almost 10 years ago.
 
Has anything in ASIO changed over 10 years?  I need to use two ASIO audio devices at the same time  (one device for input, another for output).
With Sonar Platinum in 2016, I still see the first checkbox on one device causing all selection options for any other devices to gray out.
 
10 years ago, the Windows drivers of that time were unable to provide low latency operation, so ASIO was the only real choice. I have continued to use ASIO because it works fine, but I do run into the multiple device issue often.
 
Is ASIO effectively obsolete?  With no advancement over 10 years, I'm guessing it is.
So everyone is now using WDM/KS are you are happy with it?
 
 

Actually 10 years ago WDM was out and it did provide multi channel low latency recording and playback. WDM came out with Windows ME. 
 
ASIO is a Steinberg protocol. It never supported multi cards. That has not changed.  

Hi. There are a few companies that produces Audio Interfaces that allows working with more with that one ASIO interfaces at the time. RME is one of them.
All the best.

You can use up to four Lynx interfaces together using ASIO. Lynx Two cards are so cheap I'm going to get a couple more. Should have me set for a while. I've never given WDM a real shot. It may do what you want.

Zargg71
Hi. There are a few companies that produces Audio Interfaces that allows working with more with that one ASIO interfaces at the time. RME is one of them.
All the best.

Well this has been true for a long time but its only due to the company making those products making it possible. ASIO is not meant to handle more than one audio device. Also they have to be from the same company. WDM has no such limitation. 

John

Zargg71
Hi. There are a few companies that produces Audio Interfaces that allows working with more with that one ASIO interfaces at the time. RME is one of them.
All the best.

Well this has been true for a long time but its only due to the company making those products making it possible. ASIO is not meant to handle more than one audio device. Also they have to be from the same company. WDM has no such limitation. 

That is true. Just wanted to say it is doable.

Zargg71
Hi. There are a few companies that produces Audio Interfaces that allows working with more with that one ASIO interfaces at the time. RME is one of them.
All the best.

 
We can just add that to our very long list list of good reasons to own an RME interface Ken:)

I use ASIO4All and regularly run up to 3 Tascam interfaces simultaneously, namely:
1. US-1641
2. US-1800
3. US-16x08
 
That gives me 44 inputs and 14 outputs.
 
The timing of the individual interfaces is slightly shifted w.r.t. each other, so I have to adjust manually afterwards, a task that takes a couple of minutes. The bass drum serves as a clapper board.

jpetersen
I use ASIO4All and regularly run up to 3 Tascam interfaces simultaneously, namely:
1. US-1641
2. US-1800
3. US-16x08
 
That gives me 44 inputs and 14 outputs.
 
The timing of the individual interfaces is slightly shifted w.r.t. each other, so I have to adjust manually afterwards, a task that takes a couple of minutes. The bass drum serves as a clapper board.

ASIO4All should be avoided if you can. It is not ASIO. What it is is a wrapper for WDM. All it does is make hosts think you have an ASIO driver when you really don't. This was important for running Cubase back in the day when it did not come with a generic ASIO driver. If you had a card that didn't have an ASIO driver and many did not support ASIO, Cubase did not support WDM. It only supported MME. You lost all your multiple inputs and outs. MME supports. only one stereo pair.   
 
Another reason I like Sonar it will use any any driver. 

Thanks for all the helpful responses.  I tried switching over to WDM/KS. It seems to work, and the driver reports low latency. However there are two problems with my setup.
1) Using ASIO, my Presonus 24.4.2AI mixer is a 40 input, 26 output interface in Sonar.  When changing to WDM, it becomes an 8 in 8 out interface .   That appears to be a Presonus issue.
2) Although I can add my secondary (Focusrite) interface in Sonar and use it simultaneously with the Presonus under WDM, the Focusrite channels are at the top of the list.   All my existing projects are then using the wrong interface.  I can't seem to find the mapping function to correct that - it is not changed with Friendly Names.