i just bought this pedal and used the hold effect with it like it explained how to but i only get a slight sound that remains, is this just the way it is hence not very good or is there some kind of knack of getting a louder clearer sound to remain/hold

There is a knack of getting it to hold a nice sound. Just play around with it for a good while and you'll figure it out. If you have no luck try replacing the battery and trying again.
niceone, i was holding the pedal down before i played something so it wasnt picking anything up lol, i now press it down after i play something and bingo.