Hello,
What you describe is not a bug, DJControl Inpulse 500 is intended to operate that way.
DJC Inpulse 500 includes a hardware mixer for the external inputs and outputs, which means:
- the external input controls (aux volume & filter & vumeter / mic volume & EQ & vumeter),
- the output controls (headphone volume & Cue-Master / master volume & vumeter)
are processed in hardware on DJC Inpulse 500 inputs & outputs, so if you use another audio interface, these controls are not activated on the other audio hardware.
Hardware mixing main benefit is security: using the audio inputs in hardware (and directing them on the output in hardware) makes it possible to use the external audio input as a back-up.