Can I remote control the system via MIDI or OSC?

Yes, that is possible.

KLANG:app, all KLANG processors and :kontroller exclusively communicate with each other via OpenSoundControl (OSC) messages. Find all details about the OSC messages in the OSC Reference Guide.

KLANG:app can further be controlled via MIDI / MCU.

There are also flexible third party converters from OSC to OSC or MIDI to OSC available, such as OSCulator. In this way, mixing console commands like snapshot recall or fader comnands can be converted. Additionally, tools like touchOSC can be used to design specific graphic interfaces if required.