Further optimized spectrogram performance. Five new gradient options.

New pitch practice tools and higher precision detection. Sub-Bin Refinement is a new pitch detection algorithm that extracts precise pitch data from coarse FFT bins. It can improve pitch precision by over 100× at C2, approaching the precision of chromatic tuners while keeping the real-time response of a spectrogram. To support this added precision, the pitch display now includes a reference pitch selector, -14c and +16c tuning markers for pure thirds, and selectable 20c or 40c needle ranges. The digital needle also briefly shows recent pitch variation after the sound stops. Pitch Focus helps beginners practice playing one note at a time. It can detect when a nearby unintended note is mixed in, and shows whether that competing note is higher or lower. On iPad, pitch readouts can now be enlarged for easier viewing during practice.