Hi Tracy: Symphony Pro is optimized for iPad mini, and you should be able to use it without a problem. The full virtual keyboard is available by tapping the keyboard icon at the bottom of the sidebar.
On my ipad mini, I only see two octaves of keyboard, from D below middle C and to one octave above. There is a +1 on the highest key, but it does not seem to have an effect.
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Let me know if you have any other questions.
Is it possible to use more of the keyboard range?
Glad someone's screen shot showed that!