Alex confirms he will be fixing these issues in version 1.1:
SunVox 1.0b may work incorrectly on some PalmOS devices with non-square screen. For example – Tungsten TX, Zodiac. In this case just mail me (firstname.lastname@example.org), and i’ll help you to solve this problem. Of course, this will be fixed in the next release 1.1.
I’m hoping that the next version will have some of the stuff he’s been talking about on his forum.