Forever For Now have released Diatonic Shifter 2, a real-time diatonic pitch shifting and harmonizing Audio Unit effect. The plug-in lets you create vocal harmonies, diatonic guitar dubs and microtuned leads.
Features:

• real-time, low latency processing for live performances
• high precision post-processing for studio quality results
• truly diatonic in-scale pitch shifting, harmonizing and microtuning
• robust real-time pitch tracker with integrated visual pitch monitor
• four full octaves of pitch adjustment
• extensive user manual

Diatonic Shifter 2 makes use of the standard graphical interface views for Audio Units, offering a seamless integration into host applications like Logic Express and Pro, Garageband, Final Cut Express and Pro and Soundtrack.

Diatonic Shifter 2 retails for $9.99 USD.