Thanks of the tips etc.
I do have it all working as I want it now. As far as Daw work goes, i only need the Solo to play back mixes, i don’t need it for recording, so I’m happy to just switch over at the end. Out of the Daw it will do all the audio duties.
I have/had an old 2i4 that has been my only Windows interface/audio device for years. I recently lent this out to a mate as my MODX took over. The MODX can do midi and audio both ways over USB, so it worked well as a do it all device. Just plug headphones in to the MODX and everything passes through it. The drivers are Steinberg drivers but dont seem to be causing any issues. Its the Focusrite drivers that caused me issues. Ive used ASIO4ALL in the past but never had good results with it compared to the OEM drivers i should have used.
I needed an interface for recording vocals so got the Solo. It works perfectly, as does the MODX, but i was surprised it was locking the Yamaha drivers out. I’d say part of this was user error, as i didn’t realise i needed to change the Output drivers first. That doesn't explain why after a week using Cakewalk with the MODX it suddenly wanted to use the Focusrite drivers. Installing the Solo went fine but did knock the MODX drivers out a bit. I had to re install those so maybe this was where the change happened, although I didn’t open Cakewalk during this time (i used Cubase to test the Solo).