[BEN/SCHULZ] has updated Spectrum to 1.4.497.
The free update adds optional peak curves to the frequency spectrum and the frequency scale can now be switched from log-10 to log-2 (octaves). This octave spacing is especially useful when dealing with musical material. The update also improves the readability of the info box on retina and HiDPI displays.
Spectrum is a multi-channel spectrum analyser available for Mac and PC - a free trial is available.