midi_maker interprets a text file (by convention using a .ini extension) and generates a midi file from it with the same filename in the same directory.
It uses MIDIUtil to create a MIDI file and FluidSynth if you want to listen to the generated file.
The text file syntax is a list of commands with the format: command param1=value1 param2=value2,value3....
For example:
; Definitions
voice name=perc1 style=perc voice=high_mid_tom
voice name=rick style=rhythm voice=acoustic_grand_piano
voice name=dave style=lead voice=cello
rhythm name=perc1a durations=h,e,e,q
tune name=tune1 notes=q,G,A,B,hC@6,h.C,qC,G@5,A,hB,h.B
; Performance
rhythm voices=perc1 rhythms=perc1a ; play high_mid_tom with rhythm perc1a
play voice=dave tunes=tune1 ; play tune1 on cello
bar chords=C
bar chords=Am
bar chords=D7
bar chords=G
Full details in the docs file.
There are examples of input files in the data/ directory.