Positive Grid, the creators of JamUp Pro XT for iOS, proudly announce the launch of BIAS, the world’s most complete, accurate and versatile guitar amplifier modeler and designer. Equipped with 36 stunning replications of rock ‘n’ roll history’s most sought-after vintage and modern amps, Positive Grid’s new iPad app lets musicians dive deep into the guts of their gear to tweak every possible aspect of their architecture.