I'm not sure if this is what Gruber uses, but it seems to do a good jon (supposedly): http://hivelogic.com/enkoder http://hivelogic.com/enkoder I'm sure you c

I'm not sure if this is what Gruber uses, but it seems to do a good jon (supposedly): http://hivelogic.com/enkoder http://hivelogic.com/enkoder I'm sure you could do your own simper but unique variation.