MultitrackStudio from Bremmers Audio Design is a multitrack music recording software which supports recording, editing and mixing audio and MIDI tracks. With the growth of Mac worldwide, MultitrackStudio developers felt the urgency of making their application available on macOS. They had previously used Delphi with VCL (Visual Component Library) a visual component based object oriented framework for developing Microsoft Windows applications. When Embarcadero Technologies released Delphi with FireMonkey, MultitrackStudio developers reworked their custom controls to work with both VCL and FireMonkey. The Delphi RTL (run time library functions and procedures) provided them with cross platform versions of most common functions and they could program against any C or Cocoa framework. After writing some Mac specific code including Core Audio and Audio Units, they had a running version on macOS.