The Foundation encourages producers and listeners alike to become active members, supporting the cause with a donation of $30 per year (around £18). Membership brings several benefits, including free use of the Foundation’s own TT Dynamic Range Meter software. This meter has been designed to help mastering engineers avoid producing over-compressed mixes and comes in two versions: an off-line version, which analyses a file and gives an official DR value that can be used for registering your release as a ‘wide dynamic range’ track; and a plug-in version for giving a real-time reference to dynamic range values. The plug-in is available in VST, RTAS and Audio Units formats.