frex

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Controls

• KEY MAP

  each line is a string of keys which are mapped to the note equal to their line number

• RATE

  a math expression for the rate of SEQUENCE playback (steps per second)

• SEQUENCE

  each line is a string of keys which are played at the step equal to their line number

• ROOT NOTE

  a math expression for the integer note number of the tonic

• ROOT FREQ

  a math expression for the frequency of the tonic (cycles per second)

• SCALE

  each line is a math expression for the frequency interval of the SCALE degree equal to its line number. The last line is the octave interval.

• HARMONICS

  each line is a math expression for the integer frequency interval of a sine component in the oscillator waveform

Frequency Explorer was built with these open-source libraries:

• scalemap for microtonal note-to-frequency mapping
• TinyExpr for math expression parsing
• Emscripten for compiling C → WebAssembly