Here are some links to other music/recording/multimedia related forums:

In English

http://www.steinberg.net/forums/

http://forum.cockos.com/forumdisplay.php?f=20

http://www.kvraudio.com/forum/

https://linuxmusicians.com/

http://www.gearslutz.com/board/

http://www.soundonsound.com/forum

http://recording.org/

Also, see http://www.musicradar.com/computermusic

and also http://www.prosoundweb.com/

In German (use Google Chrome, for English translation)

http://music-society.net/index.php?action=forum