1080p mkv plays with clicking sounds

[FiXXXer00]

Hello all.
I have a little problem: I hear clicks when many sound effects are playing. When double-clicking the Haali icon, at the About page, I see the Video graph whithin limits (mas 23395, Average 10878), but the Audio is at its peak at all times (max 640, current 640). I haven't found any option to raise the "Max" value for Audio, can anyone help me with that? I have searched the other forums and all, but to no result. Note that my system handles 1080p playback flawlessly, so it's not a hardware problem. Also, I have tried lower sound settings, and it worked with myspeakers set to 16bit, 8000Hz, but the audio quality made me run in terror and not try any other values.
BSPlyer Free Version is 2.56 build 1043, 26 Jul 2010, and the codecs are BSPlayer internal codecs, up to date (November 15, 2010). Tried both with the internal codecs only, and with KLite Mega Codec Pack (I know, not a great choice, but it seemed the clicks were less frequent with that, not sure if it was only a psychological effect). I guess I'm missing some codec settings, as I took all BsPlayer's Audio sections in preferences and found nothing meaningful.
If you need more details, feel free to ask.
Thank you!