hey

with  a soundblaster a 486 dx66 was capable of realtime audio if all you are running is your audio application. the problem was multitrack storage space. you should be able to get a 486 on a pinhead these days but there are some tiny cheap systems that should be easy to make a pd stompbox. thats what pd is for anyways right its like the star trek communicator software but for guitars right. hahah