UPDATE - SOLVED!!
I found the issue was the plug-in "ASIO Link Pro Tool" - which I had started using because -
https://www.reddit.com/r/Cakewalk/comments/1lrvllc/cakewalk_two_keyboards_obs_studio_not_detecting/
However today I found uninstalling "ASIO Link Pro Tool" cured the intermittent drop-outs I was experiencing in Cakewalk
I googled - and found I wasn't the only one who had that issue -
https://www.reddit.com/r/audioengineering/comments/nmoget/asio_link_pro_cutting_out/
I did NOT try the patch that fixes it - but am including the links for anyone who might need them -
https://give.academy/ODeusASIOLinkProPatcher/
and -
https://www.youtube.com/watch?v=wq86UCOCz3I
However after fiddling with both Cakewalk AND OBS Studio - I managed to find a way to NOT use "ASIO Link Pro Tool" - and get OBS Studio to detect both of my keyboards (refer to my OP below ++++++++ for the chain of hardware) -
Cakewalk -
EDIT - PREFERENCES - PLAYBACK AND RECORDING - change "ASIO" to "WASAPI SHARED"
OBS Studio -
A) For the Midi controller controlling the Behringer Pro 800 synth - with their output from the Fender guitar amp - create an AUDIO INPUT CAPTURE with the source "Device" being the Guitar amp
NOTE - my USB Audio interface needs to be switched on for the above trio to work together - although none of them need to be plugged into it
B) For the Yamaha keyboard controlling the VST plug-ins in Cakewalk - go to SETTINGS - AUDIO - and for "Desktop Audio" choose the Yamaha keyboard
Original thread below
++++++++
My original post in this thread here -
The issue -
https://youtu.be/iGcLh3cz7cQ
My set-up -
A) M-Audio midi controller (Oxygen Pro Mini) controls my Behringer Pro 800 synthesizer - both connected via USB to my PC - and the Pro 800 synth is connected to my Fender Mustang GT-40 guitar amp - no issues on Cakewalk with those three working together nicely
- it is the top-most track "MIDI" in the video link
B) My Yamaha PSR EW-425 Arranger keyboard controls the other instruments
- i.e. Kontakt "Komplete Kontrol"
"Synth 1 Librarian" x 2
"RT 7070" Drum machine (which is a lovely free substitute for the Roland 707 Drum machine I found today)
For some reason - on Cakewalk the Audio as you will hear in the video cuts out for a few seconds every so often
(I've only activated the Drums here to make it easier to hear the Audio drops - but the same issue is with the instruments in "Komplete Kontrol" / and the Tones in "Synth 1")
I've googled for various fixes - none of which cure it
Also - I am using the "ASIO Link Pro Tool" as the ASIO driver - as without that "OBS Studio" doesn't detect the Audio from my Yamaha keyboard - and Cakewalk doesn't like "ASIO4ALL"
Any clues as to what might be causing that intermittent drop of Audio - and how to fix it?
Note - I am NOT using my M-Audio "M-Track Duo" USB Audio interface - as having that switched on causes Popping and Stuttering in "OBS Studio" recordings
- so the Yamaha having its own ASIO Soundcard and Speakers is effectively the Audio interface
Many thanks