syntax for wps condtional

[Frankenpod]

Does anyone know why this statement doesn't work?

%?if(%St(bass), !=, 0)<%alBass %ar%St(bass)dB|>

The result always displays the bass boost, even when its actually zero.  Is there another way of telling it not to show it if it hasn't been changed from zero?

Thanks

Nevermind - mystifyingly it seems to work on the ipod even though it doesn't on the emulator.