About PSP Audioware TripleMeter :
PSP TripleMeter offers three different meters - VU meters, RMS meters, and PPM meters – with discrete features such as calibration, and shared features such as trim faders, filters and a label strip.
Their goal was to offer you the ability to choose between different audio measurement tools while processing audio. Now, with a single click you can check the volume units (VU) measurements of a signal and compare it to the peak indications or RMS values!