Big thanks to Filipefaria in our forum for this one. Terratec released (18/07/02) some new drivers for this soundcard - DMX 6Fire 24/96 - WDM Driver 5.0.2000 Build 125a for Windows 98SE/ME/2000 and XP.

BugFix only for microWAVE Extension Download Terratec DMX 6Fire 24/96 WDM Driver 5.0.2000 Build 125a for Windows 98SE/ME/2000 and XP