This is Behringer's high-grade 45-mm Ultraglide faders. The faders are, after all, the heart and soul of each mixer. With their 500,000 cycles life expectancy, they outperform standard faders more than 20-fold. VCA (Voltage Controlled Amplifier) technology goes hand in hand with their faders .Audio signal does not run directly through them.Instead, the faders only provide a control voltage to the VCAs. The advantages are practically no audio noise caused by mechanical wear.It widens the stereo image and adds life and transparency to your sound ,it's a great way to put a unique finishing touch to your sound and make it feel bigger and wider.