If you have problems with stuttering or crackling sound, or if you get DirectSound errors when starting The Longest Journey, try this:
From Control Panel, open 'Multimedia' (possibly called 'Sounds and Audio Devices' or 'Sounds and Multimedia'). Go to the 'Audio' tab. For the playback device, check to make sure your sound card is selected. (If you have a modem installed, the modem may be listed here, and that can cause problems with TLJ. Change it from your modem to your sound card.)
While still on the Audio tab, click the 'Advanced' button under the playback device. Click on the 'Performance' tab. Set the hardware acceleration level to 'Full'. Click 'Ok' to save your changes, then try TLJ and see if sound problems persist.
If the 'Full' acceleration level doesn't help, you can try each of the other acceleration levels until you find the one that works best. It may also help to adjust the sample rate conversion quality (found right beneath the hardware acceleration level).
Oh, and make sure you change these settings for the playback device, *not* the recording device.