LPB should be set to 4. I also have this set to that value. Works more like a drumcomputer that way.
And don't forget the maestrix http://aminet.net/util/libs/TheMaestrix.lha. This program allows you to use AHI with SS.
What!? Does this really work?
Based on Richard Korber's work, The Maestrix emulates the functionality of his
Maestix MaestroPro API library, but instead works through AHI. Now any tools
you have which can play using the maestix.library can now be directed through
AHI. As an example of the possibilites, SoundStudio can use this library, so
now you can use SoundStudio to play multi-track 16-bit modules through AHI!
Yes, now all you AmigaOS4 users can play with SoundStudio once again, and
catch up from where you left off without the need to wait for an OS4 native
version. It also works with standard 4 tracker modules as well, so you don't
have to worry about not having CIA timers, Paula hardware, or how SoundStudio
doesn't directly support AHI. Now it can!