I do like to make use of a synth now and then. It has a proper synth though, none of those 'modelling' pedals you can get for your bass guitar. They just never sound great. I had a Roland SH-201 analogue modelling synth, which was a great item. I could sit around with that and mess on with sounds for hours.
When I'm in the studio the keys player in our group usually brings his Moog Voyager and a Roland Fantom. Those two items are serious pieces of kit which I love to fiddle on with. At home he has a rare Oberheim Xpander, which is one of my all time favourite synths. Vince Clarke was the master of this one back in the 80's, and it consistently sounds fantastic.