I use Scaler with an external hardware synth (Korg Kronos). The DAW I am using is Reaper 6.
The problem I have is that the Kronos loves sending sysex messages. Move the vector joystick and it outputs sysex, adjust a filter setting and it emits sysex. The slider controls for drawbar organs send sysex etc.
Reaper itself handles sysex correctly, but Scaler seems to discard incoming sysex and uncommon CC messages.
This problem could be solved, if Scaler instead of discarding incoming sysex and unutilised CC comands it just echoed them back to the sender (the Kronos).
Many high end Korg and Yamaha synths make heavy use of sysex.
Local control must be turned off in the Kronos for operation with Scaler. But it is impossible to adjust timbres and filters and EQs because Scaler is discarding the messages.
With the ability to echo incoming sysex back to the source the problem would be fixed and would make Scaler a formidable compositional tool for working with a Kronos or Oasys synth.