Fixed a bug that could cause a failure to resume operation after an audio interruption such as an alarm or incoming call.

Fixed a bug that caused an incorrect analysis bandwidth to be used for constant bandwidth and and mel spectra in the spectrum mode. Improved spectrogram image quality and reduced flicker when zooming out in the vertical direction. Updated to meet new technical requirements from Apple.

Bug fixes and performance improvements

Added support for constant-bandwidth and mel-scale spectrograms. Fixed a bug that could cause the colors of scales to fail to update immediately after being changed in the settings.

Fixed a bug that caused the tap-to-measure function of the Pro in-app purchase to display the left channel measurements for both channels when measuring a stereo input. Performance improvements and documentation updates.

With the Pro in-app purchase, you can now measure the frequency and amplitude of a frequency component simply by tapping on it.

When using an external stereo audio interface, display each channel in a different color. Added a preference for the audio input source, for choosing among the built-in microphones on devices with multiple microphones, or among the input connectors of certain external audio interfaces. Added a preference for choosing the polar pattern (directivity) of internal microphones that support multiple polar patterns. Fixed a one-sample glitch that occurred periodically about once every two minutes. iOS versions older than iOS 12 are no longer supported. Bug fixes and performance improvements.

Bug fixes and performance improvements. The Pro in-app purchase now includes a spectrum view.