Systems and processes that use MIDI mapping technology for multiple chord and arpeggio triggering are disclosed, including a multiple chord and arpeggio triggering MIDI mapping system and process that assigns, selects, and records chord and multi-arpeggio functions into a digital audio workstation (DAW) host program or an internalized sequencer and a two-phase multiple chord and time-delayed arpeggio triggering MIDI mapping process for recording a chord progression and enabling multi-arpeggio functions of the chords in the chord progression to be worked on at any time-delayed instance after recording the chord progression. The system divides output from a MIDI controller into chord generators and arpeggiators to allow users to define full chords with a single key selection, while also making immediate or time-delayed single key selections for different arpeggios.