This is a multi-part message in MIME format. ------=_NextPart_000_005F_01C68E11.FE088FC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit > when I need the last four numbers the time required to > generate the numbers could be excessive to say the least What would you call excessive ? AIUI you want to create a sequence from 2 (min) to 127 (max) using numbers once and once only. I've done similar s/w in the past, with a very much longer sequence, and didn't really notice a problem. Besides, as you say later - > The PIC will select the first file number and send the file to a > player. Once that file is played the PIC will select the next file > number in the sequence and send it to the player That time during the playing of the first selection is also available to the PIC for completing the sequence ? You need only have the first number to start playing Martin K wrote - > there are many novel techniques involving hardware generation > such as heat patterns, radiation, human interaction intervals, etc. I've used this noise source method often http://home.clear.net.nz/pages/joecolquitt/white_noise.html The attached shift register circuit works well too ------=_NextPart_000_005F_01C68E11.FE088FC0 Content-Type: image/gif; name="noise_4006.gif" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="noise_4006.gif" R0lGODlhnwFlAYAAAAAAAP///ywAAAAAnwFlAUAC/oyPqcvtD6OctNqLs968+w+G4kiW5ommGhCw iavG8kzX9o2LcM73/g8MChe7ofGITCqXh2LraQDApMyq9YrNMpzarncLnTZd4q8ZIU2r01Dw+Q1/ reftOJLrIEfwqTmdL6Mn2ELGRljEoncYFUXV6GRYA0jEaFc1qaD4gJnBiVa5Yrnh2VmhKYoKQYqx Gjaaygqr1Xp55UkriyvLo6vUa3O7aypsG+fn2JbY+Al6Ekws8Qs9I31UTR09vae9dM098vztJm7k Tf4Rfs6snkdjzq7yfiZvSa8Kb2V/78ooVsYR6VE8ZE0GIiKIBmHACTsWLhzDxRyiFyWmqEmI56G+ 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