MidiToSonicPi

This python code is a script which converts Tone.js formatted JSON into Sonic Pi Code. However, I am currently reworking the program into something that doesn't convert the midi file into JSON.

Using

To use the script on any midi file, for example, allstar.mid, you need to first convert into a JSON by going to the Tone.js MidiConvert website. Copy and paste the result into data.json and run either python run.py or python3 run.py and the result will be outputted to code.txt.

One thing to note however is that the amount of notes in the song is by default capped at 200. This is because having too many notes in a song will slow down Sonic Pi stop it from executing. For example, examples/pluginbaby.json has over 1550 notes, which Sonic Pi just can't handle.

Settings

You can change how the script converts the JSON file in the file settings.json. Here's a brief rundown of all the parameters:

• path: str: This sets the path to the JSON file to convert. For example, to run hello.json, you need to change it to examples/hello.json. By default it's data.json.

• synth: str: Sets the synth to be used at the top of the Sonic Pi file. For example, pretty_bell converts to use_synth :pretty_bell. By default, it's set to piano. A word of warning, however: setting it to something like blade will cause all the notes to blend together and become an inharmonic mess.

• speed_multiplier: num: Multiplies all the timings by the number given. For example, setting it to 2 will make the song twice as slow, whereas setting it to 0.1 will make the song 10 times as fast. By default, it's 1.

• pretty: bool: Controls whether the code should be condensed (take up as little space as possible) or be nice and separated. You can either type it as true or "true" but not as True or "True", as JSON gets upset. By default, it is true.

• cutoff: int: Cuts off the song at that number of notes. If you set it to "false", then there is no limit, but as I mentioned before, the song will take ages to run in the Sonic Pi software.

• shift: int: Shifts all the notes by the number given. For example, if you have the melody:

  use_synth :piano
  
  play 61
  sleep 0.3
  
  play 63
  sleep 0.3
  
  play 64
  sleep 0.3
  
  play 66
  sleep 0.3
  
  play 68
  sleep 0.3
  

  Which is in D minor, and you want to convert it to A minor you count the number of semitones D is away from A and set that as the shift.