HOFA 4U Goniometer & Korrelator
main features:
switchable between goniometer and correlation meter
new type of goniometer with peak, hold and energy-indicator
innovative und intuitive correlator
changeable plugin window size
manual onboard
works latency-free and with all common sample rates
for PC and Mac, 32 and 64 Bit DAWs
Audio Unit, VST, VST3, RTAS and AAX
More information & download here.