JL Sonogram

An invaluable tool to any producers set. I find that seeing the music in the time and frequency domain simultaneously helps me make rational decisions in the mix and especially in the arrangement phase. Try running some Aphex Twin through it and see what happens 0.o

This is especially great for visually inspired individuals. It tool has helped me reach the next level in my sound in the past, often making the difference in the clarity of the outcome. Whether or not you're metering, creating or just watching, this is the too you need... Not to mention how easy it is on your CPU compared to a VST.