Ever wanted to tool around with some vintage Roland machines with a pile of guitar pedals? Check this site out... it's fantastical fun.
I saw this new site featured in Wire mag online. Thought to myself, "ah not another rebirth sort of thing..." - - I must admit this is a lot of good fun. Especially because of all the separate fx pedal routing!
To make yer own 303 riffs just pick and clear a pattern and away you go. Also, the 808 and 909 has some empty user banks for you to create your own patterns.