I needed this plug-in badly too! I was UNDER-modulating half the time and over-modulation the other half. It's much easier now to keep an eye on the LEDs than the meter itself. Sometimes the needle goes a little wacky and can't keep up, but the LED's have no problem. It's easy to keep it in green LEDs with yellows on some peaks, with an occasional red to remind me not to get so excited. It's well worth the money spent.