#1
#1. My peavey vypyr 60 tube sounds great, genreally. but howcome when I put my looper(dd-7) into the mix and then start playing on top of the track that was just recorded does that track fade out and sounds really bad?

#2. Howcome on my Peavey Revalver software, my playing and the sound coming from the speakers of my computer aren't synced? the cord i'm using(USB) to hook the amp to the comp. is high-speed.
Gear

Guitars
Ibanez ART 300
Squier Strat
Godin 12 string Antique cedarburst
Ibanez RGD 320

Amps
Peavey Vypyr Tube 60W
Peavey Solo 15 W
Fender 10 W

Effects
Dunlop GCB - 95 Crybaby wah
Boss DD-7 Digital Delay
Boss MT-2 Distortion