I have a SIMPLE answer for you here : *SELL YOUR 5150 if you want SILENT PLAYING/RECORDING. * Especailly if you rely on your Amp Overdrive as your lead tone. *
* The Hush Unit is nice. Rack or Pedal version. *I use a Boss VF-1 Multi effects unit at the end of my chain for delay, reverb, and N/R. *for the price, its a fine N/R that works great live, even with heavy distortion. *
* *Try experimenting with less gain on the amp, *or the "vai method" which is used by many, and that is light overdrive on the amp, pushed even further with an
overdrive pedal. *This may remove some hiss, since the gain is coming from a more silent pedal. *I havent really tried that with my rig yet (I can't find my DS-1! ARGH!) but many swear by this combination. *
* *The hissing of a 5150 is what you get from that much gain. *I sold mine and got a
Sansamp PSA-1 and a 30 band EQ rack unit. *My tone is even sicker now, and Silent.