Quick Answer: Liquid Notes is a harmony & melody editing tool for MIDI arrangements. It doesn't come with an audio routing panel.
Recording the audio output of Liquid NotesLiquid Notes was designed as tool for fast editing of harmony and melody of symbolic music, i.e. MIDI. As such, the software is capable of making complex changes to harmonic progressions in multi-track MIDI arrangements with the turn of a knob or move of a slider.
Any change made to your arrangement is audible, either by playback of your song or via the acoustic chord preview function. For playback and preview of audio either the internal synth of Liquid Notes, or the virtual instruments of your DAW are being used.
Recording the audio output is not directly possible in Liquid Notes, then.