The bttd document has been posted here: http://www.talkbass.com/bttd.html.. This is an online HTML document that all those who are interested in could read and apply when we are attempting to review a new instrument or amp or cab, whatever or when we are asking for help or advice with a problem or inquiring about a particular sound we are after in a system we want to put together. steve_man got together some terms based on a BP article and I HTML'd it (did some minor editing and adding a tone term "sub-dub", if anyone has suggestions for refining that or any other term(s) listed, let me know and we'll chase it around the block a few times). One thing that I think it would be good to add would be bass frequency sub-ranges: a name for the sub-range, lower and upper note, and a frequency range specification in Hz. For instance: Very Low Bass, C#0 - Eb1, 17Hz - 39Hz. I am open to other suggestions, but want to avoid making the document so complicated that it becomes a pain to try to use. If someone wants to tackle the bass frequency sub-range thing, let me know (here's a good cross-reference for that effort: http://www.stanford.edu/~kbrand/EE122/Project crapola/Frequencies.htm.