Decibel Sound Meter Pro
Vlad Polyanskiy
ARK-1: Arabic Keyboard
Apptrax
FM Player: Classic DX Synths
AudioKit Pro
Yamaha Synth Book – US
Yamaha Corporation of America
VoiceKeyboard Lite
Terry Demco
Mini Piano
Richard Foster
FM Essential – US
Yamaha Corporation of America
The Oscillator
Kymatica AB
SampleTank CS
IK Multimedia