Gate/Expander block

Every preset has a noise gate. It's not a block, it's sort of hidden on a page in the Layout menu. Hold Bypass to reset to default (which is: switched on). Or turn Threshold to zero to switch it off. The Noise Gate needs quite a bit of CPU power, so switch it off if you have no need for it in a preset.

• The Ultra allows you to add additional noise gates (Gate/expander block) to the grid. Try placing it before the amp, with Side-chain set to input. This way the input signal controls the gate which is what works best. No need to put it after the Amp block.
• This thread contains a different approach to keeping the noise low. It's a Vol block with the volume parameter tied to the Envelope controller. As long as you don't hit the strings, the (input) signal is off. Yet another approach is to put an envelope-controlled lowpass filter at the start of the chain, tied to the Frequency parameter.

http://forum.fractalaudio.com/threads/30163-YT-Energyballs