A CLI synthesizer written from scratch in Python

The program also accepts multiple file custom file formats in order to modify settings and/or automatically playback a song.
The formats are as such:

• '.wave.psynth' - A file that specifies a specific waveform. Each line details a wave:
  • The first token is the waveform type:
    • '1' - Sine wave
    • '2' - Square wave
    • '3' - Sawtooth wave
    • '4' - Triangle wave
  • The second token is the offset of the wave frequency (multiplication factor)
  • The third token is the amplitude of the wave
  • The fourth token is the phase of the wave
  • Example: 1 1 1 0 - A sine wave with the same frequency as the note, amplitude of 1, and phase of 0
  • Example: 2 2 0.5 0 - A triangle wave with half the frequency of the note (thus, an octave lower), amplitude of 0.5, and phase of 0
• '.envelope.psynth' - A file that specifies a specific envelope. Each line details an envelope:
  • The first token is the envelope type:
    • '1' - Linear envelope
  • The second token is the attack time of the envelope
  • The third token is the decay time of the envelope
  • The fourth token is the sustain level of the envelope
  • The fifth token is the release time of the envelope
  • Example: 1 0.1 0.1 0.5 0.1 - A linear envelope with an attack time of 0.1 seconds, decay time of 0.1 seconds, sustain level of 0.5, and release time of 0.1 seconds
• '.song.psynth' - A file that specifies a song. Each line details a note:
  • The first line is the name of the song
    • This can be as long as you wish, the main criterion being that it is a single line
  • Any subsequent lines are song metainfo
    • The first token is the metainfo type:
      • '1' - BPM
        • The second token is the BPM of the song
        • By default, this will be assumed to be 100
        • Example: 1 120 - A song with a BPM of 120
      • '2' - Waveform
        • The second token is the path to the waveform (a '.wave.psynth' file)
      • '3' - Envelope
        • The second token is the path to the envelope (a '.envelope.psynth' file)
  • The metainfo section is terminated by a line consisting of '---'
  • Any subsequent lines are notes
    • The first token is note count
    • This is then followed by the note count number of notes
      • Notes are formatted as such: <note>:<duration>
    • Example: 1 C4:1 - A C4 note with a duration of 1
    • Example: 2 C4:1 D4:2 - A C4 note with a duration of 1 and a D4 note with a duration of 2
    • Example: 0 - An empty beat

Additionally, all formats support $ comments. Any line that begins with a $ will be ignored by the program.