Softer edge brushes

Hi chaps- I've been using pshop for years but rarely for 'painting' - I now though have a project and I want to paint some thin very soft lines ... let me attempt to explain ... if I wind hardness down as far as I go and use a small brush the edge is still much too 'hard' - I want more of a 'glow effect from the brush ... more blurred ... I've tried reducing the opacity but it doesn't really help - is there anyone out there who understands my dilemma please ? Regards Roger

Hi Christina, what a clever idea - thank you - Roger