[LAU] progressive time stretch

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, I have a percussion piece written in hydrogen and recorded from there into ardour 3, one track per instrument. At a certain point I'd like to have an accelerando, i.e. a progressive tempo increase. What are my options? Best would be able to do it from within ardour, having many tempo changes, ardour set as jack master, so that when I play that part it gradually increases the jack playback tempo. The second solution would be to export the mix from ardour and use another program to increase the tempo in the .wav file. The problem is I'm not sure how exactly go about for neither solution... for the first one, could I use a knob on my midi controller to generate a smooth succession of tempo changes? How? For the second, which program could I use? I seem to recall there was some utility to generate rubberband map files, but I can't find it ATM. cheers, renato