From Digital Confidence:
MetadataTouch is a multi-format metadata editor. It enables you to view and edit metadata in Microsoft Office documents (Word, Excel, and PowerPoint), OpenOffice documents, JPEG, JPEG 2000, AVI, MP3, MP4, F4V, WAVE, AIFF, PNG, SVG, APE, MPC, OFR, WV, TAK, and XMP files. MetadataTouch is a standalone application that does not requires any other software to be installed in order to view and edit metadata. With MetadataTouch you can edit metadata fields such as revision number and total editing time that you can't edit with the standard applications. MetadataTouch can also export and import metadata templates. With its ability to view and edit metadata in 23 file types, MetadataTouch is a tool for metadata management, and it is also useful for e-discovery and digital forensics specialists.
What's new in this version:
Version 6.8 added support for XMP metadata in AIFF audio files, support for ISRC code in BWF / WAVE files.