If you have an Echo audio card, especially an Echo Indigo i/o, please load up the PlugSound Free VSTi into FLS and listen for crackling. If you don't have PlugSound Free, try Crystal or RGC SFZ+
Many VSTi's on my system don't seem to be affected within FLS, so I can't figure out what happened. All my DXi's within FLS are fine. It's inexplicable.

