SynthModules

hi all. i see that there are various bits of software available which 
turn the PSIM into an LFO/LFO's. i have a couple of questions about 
this. 

firstly, how smooth are they at very slow rates, e.g. if you put a 
really slow sine on the pitch of an oscillator, can you hear any 
stepping?

next up, at the other end of the frequency spectrum, how do these 
LFO's sound when driven into the audio rates? i know the PSIM is not 
designed to do audio, but it must be possible? how does it sound? how 
easy would it be to implement PWM etc.

cheers,

gregg.