I like playing unison lines - like Donna Lee, Scrapple The Apple, Solar - stuff like that - plus yeah I guess I play melodic bass parts when I'm jamming with my Boss RC20 - which is great for working out multi-part solo bass stuff (if that's not a contradiction in terms!). I like to step on the Whammy pedal sometimes too - when I go into Doug Wimbish mode.... don't forget the groove mind!