Registered MOTU Symphonic Instrument owners can obtain the authorization from MOTU technical support. ufs file requires a new iLok authorization. The UFS format allows you to access the Symphonic Instrument sound library via MachFive 3 or UVI Workstation 2 on today's latest Mac and Windows systems, including 64-bit systems. This download contains the Symphonic Instrument sound library in the form of a.