Ok, here is how it works to get your own cs-botchat: You need some recording software (
http://audacity.sourceforge.net/ for example) and a micro (or headset). Than just record the botchat-sound in Mono/22kHz. To change the sound you can pitch or change the speed. Than you can add a "radio-filter" if you like. Save the wav-sound in the right directory -finished!
The audio-format for cs-botchat is: Mono, 22kHz, wav
The file-size should be about 10-30kb/file (eg.