Very simple:
It did not comply to our guidelines.
Our new message system will come in the next year and then we will notify users with exact reasons again for any editing or removing of threads. Until then I am sorry, but there is no way we can actually send that to you at this time.
We value all contributions to the forum, but as stated in out guidelines which you find here:
http://www.digitaldjtips.com/posting-guidelines/
we are a high quality forum. Any violation of the guidelines and the thread will be edited or removed. In case of a removal at least 2 guidelines were crossed, even if I do not remember which ones in your case (I do moderate a lot…).
Thanks for your contributions and sorry for any inconvenience this may have caused.