POSITIVE GRID JAMUP PLUG INTERFACE AND JAMUP APP Rock your iOS The JamUp Plug is a simple and super compact iOS audio interface designed to complement Positive Grid’s guitar effects apps, JamUp Pro and the free JamUp Lite. It’s easy to see why these guitar effects apps have been earning top reviews in the App Store. Features such as a highly flexible signal chain, a handy MP3 import option, and a looping phrase sampler turn an average iOS device...