Hello Everyone, Recently, I implmented an audio capture filter in avstream architecture under XP, and then I implment it's volume node to get a volume control on my capture filter. After a lot of try and error, I finally made the volume scroll bar work. However, the volume range of scroll bar does not hornor the lower bounds of KSPROPERTY_STEPPING_LONG, but honor the upper bound. I have tried to implment BASICSUPPORT handler, but it did not work. I found somebody run into the same problem here, if this were solved, could any one help? P.S: The volume range can work normally under Win7. Thank you in advance~