Yo Scott, i would just get a little contract set up (makeshift studio terms and conditions) if the lads dont agree to what percent (of overall sales) you get out of the tunes YOU are producing, then tell em to **** Off...you have done some wikid music for them dudes and i think you deserve a piece of the cake and if you tell them the way you feel im sure they will agree to sort you out more than just studio time...then things will be fair! dont let then take advantage mate!