Incorrect octaves and samples-per-octave displayed in pad synth UI

[fundamental]

Migrating from a comment in #369

The old Zynaddsubfx interface shows 2 samples/octave and 6 Octaves.
The ZynFusion interface shows 2 SMP/OCT and 5 Octaves.
You can change the values on both old and new interface but the old interface always shows 1 more octaves than the zynFusion.

Exporting the wave file (via the old interface ) appears to produce the correct number of sample files based on the values displayed in the old interface (ie 2*6=12 wav files).