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Reference Frequency

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The reference frequency control adjusts the frequency of the tuning system’s first pitch, for example yegāh = 98 Hz or ʿushayrān = 110 Hz.

  • Arc knob: drag to adjust (±700 cents range).
  • Hz input: type an exact frequency; use up/down arrow keys for ±1 Hz nudges.
  • Cents display: shows the current offset in cents.
  • Semitone buttons (±): shift by 100 cents.
  • Transposition indicator: shows the IPN shift (e.g. “C ↗ C#” or “G ↘ F#−”).

The reference frequency persists relatively when switching tuning systems or starting note names. For example, if you select a tuning system with starting note name yegāh = 98 Hz and change it to 100 Hz, then switch to ʿushayrān, the plugin will use 112.25 Hz rather than reverting to the default of 110 Hz.