Crane Song IBIS Stereo EQ Mastering Crane Song IBIS Mastering Version Stereo Equalizer – The fully-stepped version of the original IBIS. The Crane Song IBIS Stereo Equalizer boldly takes equalization to a new level of musicality. Each of its four bands features switch-selectable frequencies centered on and covering musical-step intervals from 32-Hz “C” to 22.35-kHz [...]