Head scrather... Studio one 3.5.6 only receives audio and can record when 18/24 interface is turned OFF.... wait, the audio that is being recorded is coming from internal computer mic, not the 18/24 interface.
Had unit for two years worked well until I updated Universal Access. After struggling, I reinstalled both programs from original software download but problem was not solved.
I am running Mac OS Yosemite 10.10.5
PreSonus Studio 18/24 USB
StudioOne 3.5.6.46910
Universal Control 2.6.0
On playback and mixes 18/24 functions normally.
thank you